LXR linux/include/uapi/linux/netfilter/nf_conntrack

   1#ifndef _UAPI_NF_CONNTRACK_COMMON_H
   2#define _UAPI_NF_CONNTRACK_COMMON_H
   3/* Connection state tracking for netfilter.  This is separated from,
   4   but required by, the NAT layer; it can also be used by an iptables
   5   extension. */
   6enum ip_conntrack_info {
   7        /* Part of an established connection (either direction). */
   8        IP_CT_ESTABLISHED,
   9
  10        /* Like NEW, but related to an existing connection, or ICMP error
  11           (in either direction). */
  12        IP_CT_RELATED,
  13
  14        /* Started a new connection to track (only
  15           IP_CT_DIR_ORIGINAL); may be a retransmission. */
  16        IP_CT_NEW,
  17
  18        /* >= this indicates reply direction */
  19        IP_CT_IS_REPLY,
  20
  21        IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
  22        IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
  23        IP_CT_NEW_REPLY = IP_CT_NEW + IP_CT_IS_REPLY,   
  24        /* Number of distinct IP_CT types (no NEW in reply dirn). */
  25        IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
  26};
  27
  28#define NF_CT_STATE_INVALID_BIT                 (1 << 0)
  29#define NF_CT_STATE_BIT(ctinfo)                 (1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
  30#define NF_CT_STATE_UNTRACKED_BIT               (1 << (IP_CT_NUMBER + 1))
  31
  32/* Bitset representing status of connection. */
  33enum ip_conntrack_status {
  34        /* It's an expected connection: bit 0 set.  This bit never changed */
  35        IPS_EXPECTED_BIT = 0,
  36        IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
  37
  38        /* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
  39        IPS_SEEN_REPLY_BIT = 1,
  40        IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
  41
  42        /* Conntrack should never be early-expired. */
  43        IPS_ASSURED_BIT = 2,
  44        IPS_ASSURED = (1 << IPS_ASSURED_BIT),
  45
  46        /* Connection is confirmed: originating packet has left box */
  47        IPS_CONFIRMED_BIT = 3,
  48        IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
  49
  50        /* Connection needs src nat in orig dir.  This bit never changed. */
  51        IPS_SRC_NAT_BIT = 4,
  52        IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
  53
  54        /* Connection needs dst nat in orig dir.  This bit never changed. */
  55        IPS_DST_NAT_BIT = 5,
  56        IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
  57
  58        /* Both together. */
  59        IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
  60
  61        /* Connection needs TCP sequence adjusted. */
  62        IPS_SEQ_ADJUST_BIT = 6,
  63        IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
  64
  65        /* NAT initialization bits. */
  66        IPS_SRC_NAT_DONE_BIT = 7,
  67        IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
  68
  69        IPS_DST_NAT_DONE_BIT = 8,
  70        IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
  71
  72        /* Both together */
  73        IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
  74
  75        /* Connection is dying (removed from lists), can not be unset. */
  76        IPS_DYING_BIT = 9,
  77        IPS_DYING = (1 << IPS_DYING_BIT),
  78
  79        /* Connection has fixed timeout. */
  80        IPS_FIXED_TIMEOUT_BIT = 10,
  81        IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
  82
  83        /* Conntrack is a template */
  84        IPS_TEMPLATE_BIT = 11,
  85        IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
  86
  87        /* Conntrack is a fake untracked entry */
  88        IPS_UNTRACKED_BIT = 12,
  89        IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
  90
  91        /* Conntrack got a helper explicitly attached via CT target. */
  92        IPS_HELPER_BIT = 13,
  93        IPS_HELPER = (1 << IPS_HELPER_BIT),
  94};
  95
  96/* Connection tracking event types */
  97enum ip_conntrack_events {
  98        IPCT_NEW,               /* new conntrack */
  99        IPCT_RELATED,           /* related conntrack */
 100        IPCT_DESTROY,           /* destroyed conntrack */
 101        IPCT_REPLY,             /* connection has seen two-way traffic */
 102        IPCT_ASSURED,           /* connection status has changed to assured */
 103        IPCT_PROTOINFO,         /* protocol information has changed */
 104        IPCT_HELPER,            /* new helper has been set */
 105        IPCT_MARK,              /* new mark has been set */
 106        IPCT_SEQADJ,            /* sequence adjustment has changed */
 107        IPCT_NATSEQADJ = IPCT_SEQADJ,
 108        IPCT_SECMARK,           /* new security mark has been set */
 109        IPCT_LABEL,             /* new connlabel has been set */
 110};
 111
 112enum ip_conntrack_expect_events {
 113        IPEXP_NEW,              /* new expectation */
 114        IPEXP_DESTROY,          /* destroyed expectation */
 115};
 116
 117/* expectation flags */
 118#define NF_CT_EXPECT_PERMANENT          0x1
 119#define NF_CT_EXPECT_INACTIVE           0x2
 120#define NF_CT_EXPECT_USERSPACE          0x4
 121
 122
 123#endif /* _UAPI_NF_CONNTRACK_COMMON_H */
 124