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001: #ifndef _NF_CONNTRACK_COMMON_H
002: #define _NF_CONNTRACK_COMMON_H
003: /* Connection state tracking for netfilter.  This is separated from,
004:    but required by, the NAT layer; it can also be used by an iptables
005:    extension. */
006: enum ip_conntrack_info {
007:         /* Part of an established connection (either direction). */
008:         IP_CT_ESTABLISHED,
009: 
010:         /* Like NEW, but related to an existing connection, or ICMP error
011:            (in either direction). */
012:         IP_CT_RELATED,
013: 
014:         /* Started a new connection to track (only
015:            IP_CT_DIR_ORIGINAL); may be a retransmission. */
016:         IP_CT_NEW,
017: 
018:         /* >= this indicates reply direction */
019:         IP_CT_IS_REPLY,
020: 
021:         IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
022:         IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
023:         IP_CT_NEW_REPLY = IP_CT_NEW + IP_CT_IS_REPLY,   
024:         /* Number of distinct IP_CT types (no NEW in reply dirn). */
025:         IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
026: };
027: 
028: /* Bitset representing status of connection. */
029: enum ip_conntrack_status {
030:         /* It's an expected connection: bit 0 set.  This bit never changed */
031:         IPS_EXPECTED_BIT = 0,
032:         IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
033: 
034:         /* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
035:         IPS_SEEN_REPLY_BIT = 1,
036:         IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
037: 
038:         /* Conntrack should never be early-expired. */
039:         IPS_ASSURED_BIT = 2,
040:         IPS_ASSURED = (1 << IPS_ASSURED_BIT),
041: 
042:         /* Connection is confirmed: originating packet has left box */
043:         IPS_CONFIRMED_BIT = 3,
044:         IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
045: 
046:         /* Connection needs src nat in orig dir.  This bit never changed. */
047:         IPS_SRC_NAT_BIT = 4,
048:         IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
049: 
050:         /* Connection needs dst nat in orig dir.  This bit never changed. */
051:         IPS_DST_NAT_BIT = 5,
052:         IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
053: 
054:         /* Both together. */
055:         IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
056: 
057:         /* Connection needs TCP sequence adjusted. */
058:         IPS_SEQ_ADJUST_BIT = 6,
059:         IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
060: 
061:         /* NAT initialization bits. */
062:         IPS_SRC_NAT_DONE_BIT = 7,
063:         IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
064: 
065:         IPS_DST_NAT_DONE_BIT = 8,
066:         IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
067: 
068:         /* Both together */
069:         IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
070: 
071:         /* Connection is dying (removed from lists), can not be unset. */
072:         IPS_DYING_BIT = 9,
073:         IPS_DYING = (1 << IPS_DYING_BIT),
074: 
075:         /* Connection has fixed timeout. */
076:         IPS_FIXED_TIMEOUT_BIT = 10,
077:         IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
078: 
079:         /* Conntrack is a template */
080:         IPS_TEMPLATE_BIT = 11,
081:         IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
082: 
083:         /* Conntrack is a fake untracked entry */
084:         IPS_UNTRACKED_BIT = 12,
085:         IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
086: };
087: 
088: /* Connection tracking event types */
089: enum ip_conntrack_events {
090:         IPCT_NEW,               /* new conntrack */
091:         IPCT_RELATED,           /* related conntrack */
092:         IPCT_DESTROY,           /* destroyed conntrack */
093:         IPCT_REPLY,             /* connection has seen two-way traffic */
094:         IPCT_ASSURED,           /* connection status has changed to assured */
095:         IPCT_PROTOINFO,         /* protocol information has changed */
096:         IPCT_HELPER,            /* new helper has been set */
097:         IPCT_MARK,              /* new mark has been set */
098:         IPCT_NATSEQADJ,         /* NAT is doing sequence adjustment */
099:         IPCT_SECMARK,           /* new security mark has been set */
100: };
101: 
102: enum ip_conntrack_expect_events {
103:         IPEXP_NEW,              /* new expectation */
104:         IPEXP_DESTROY,          /* destroyed expectation */
105: };
106: 
107: /* expectation flags */
108: #define NF_CT_EXPECT_PERMANENT          0x1
109: #define NF_CT_EXPECT_INACTIVE           0x2
110: #define NF_CT_EXPECT_USERSPACE          0x4
111: 
112: 
113: #endif /* _NF_CONNTRACK_COMMON_H */
114: 

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