include/uapi/linux/netfilter/nf_conntrack_common.h

   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. */
   6 enum 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         /* No NEW in reply direction. */
  24
  25         /* Number of distinct IP_CT types. */
  26         IP_CT_NUMBER,
  27
  28         /* only for userspace compatibility */
  29 #ifndef __KERNEL__
  30         IP_CT_NEW_REPLY = IP_CT_NUMBER,
  31 #else
  32         IP_CT_UNTRACKED = 7,
  33 #endif
  34 };
  35
  36 #define NF_CT_STATE_INVALID_BIT                 (1 << 0)
  37 #define NF_CT_STATE_BIT(ctinfo)                 (1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
  38 #define NF_CT_STATE_UNTRACKED_BIT               (1 << (IP_CT_UNTRACKED + 1))
  39
  40 /* Bitset representing status of connection. */
  41 enum ip_conntrack_status {
  42         /* It's an expected connection: bit 0 set.  This bit never changed */
  43         IPS_EXPECTED_BIT = 0,
  44         IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
  45
  46         /* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
  47         IPS_SEEN_REPLY_BIT = 1,
  48         IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
  49
  50         /* Conntrack should never be early-expired. */
  51         IPS_ASSURED_BIT = 2,
  52         IPS_ASSURED = (1 << IPS_ASSURED_BIT),
  53
  54         /* Connection is confirmed: originating packet has left box */
  55         IPS_CONFIRMED_BIT = 3,
  56         IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
  57
  58         /* Connection needs src nat in orig dir.  This bit never changed. */
  59         IPS_SRC_NAT_BIT = 4,
  60         IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
  61
  62         /* Connection needs dst nat in orig dir.  This bit never changed. */
  63         IPS_DST_NAT_BIT = 5,
  64         IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
  65
  66         /* Both together. */
  67         IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
  68
  69         /* Connection needs TCP sequence adjusted. */
  70         IPS_SEQ_ADJUST_BIT = 6,
  71         IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
  72
  73         /* NAT initialization bits. */
  74         IPS_SRC_NAT_DONE_BIT = 7,
  75         IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
  76
  77         IPS_DST_NAT_DONE_BIT = 8,
  78         IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
  79
  80         /* Both together */
  81         IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
  82
  83         /* Connection is dying (removed from lists), can not be unset. */
  84         IPS_DYING_BIT = 9,
  85         IPS_DYING = (1 << IPS_DYING_BIT),
  86
  87         /* Bits that cannot be altered from userland. */
  88         IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
  89                                  IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING),
  90
  91         /* Connection has fixed timeout. */
  92         IPS_FIXED_TIMEOUT_BIT = 10,
  93         IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
  94
  95         /* Conntrack is a template */
  96         IPS_TEMPLATE_BIT = 11,
  97         IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
  98
  99         /* Conntrack is a fake untracked entry.  Obsolete and not used anymore */
 100         IPS_UNTRACKED_BIT = 12,
 101         IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
 102
 103         /* Conntrack got a helper explicitly attached via CT target. */
 104         IPS_HELPER_BIT = 13,
 105         IPS_HELPER = (1 << IPS_HELPER_BIT),
 106 };
 107
 108 /* Connection tracking event types */
 109 enum ip_conntrack_events {
 110         IPCT_NEW,               /* new conntrack */
 111         IPCT_RELATED,           /* related conntrack */
 112         IPCT_DESTROY,           /* destroyed conntrack */
 113         IPCT_REPLY,             /* connection has seen two-way traffic */
 114         IPCT_ASSURED,           /* connection status has changed to assured */
 115         IPCT_PROTOINFO,         /* protocol information has changed */
 116         IPCT_HELPER,            /* new helper has been set */
 117         IPCT_MARK,              /* new mark has been set */
 118         IPCT_SEQADJ,            /* sequence adjustment has changed */
 119         IPCT_NATSEQADJ = IPCT_SEQADJ,
 120         IPCT_SECMARK,           /* new security mark has been set */
 121         IPCT_LABEL,             /* new connlabel has been set */
 122 };
 123
 124 enum ip_conntrack_expect_events {
 125         IPEXP_NEW,              /* new expectation */
 126         IPEXP_DESTROY,          /* destroyed expectation */
 127 };
 128
 129 /* expectation flags */
 130 #define NF_CT_EXPECT_PERMANENT          0x1
 131 #define NF_CT_EXPECT_INACTIVE           0x2
 132 #define NF_CT_EXPECT_USERSPACE          0x4
 133
 134
 135 #endif /* _UAPI_NF_CONNTRACK_COMMON_H */