root/include/uapi/linux/netfilter/nf_conntrack_common.h

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INCLUDED FROM


   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _UAPI_NF_CONNTRACK_COMMON_H
   3 #define _UAPI_NF_CONNTRACK_COMMON_H
   4 /* Connection state tracking for netfilter.  This is separated from,
   5    but required by, the NAT layer; it can also be used by an iptables
   6    extension. */
   7 enum ip_conntrack_info {
   8         /* Part of an established connection (either direction). */
   9         IP_CT_ESTABLISHED,
  10 
  11         /* Like NEW, but related to an existing connection, or ICMP error
  12            (in either direction). */
  13         IP_CT_RELATED,
  14 
  15         /* Started a new connection to track (only
  16            IP_CT_DIR_ORIGINAL); may be a retransmission. */
  17         IP_CT_NEW,
  18 
  19         /* >= this indicates reply direction */
  20         IP_CT_IS_REPLY,
  21 
  22         IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
  23         IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
  24         /* No NEW in reply direction. */
  25 
  26         /* Number of distinct IP_CT types. */
  27         IP_CT_NUMBER,
  28 
  29         /* only for userspace compatibility */
  30 #ifndef __KERNEL__
  31         IP_CT_NEW_REPLY = IP_CT_NUMBER,
  32 #else
  33         IP_CT_UNTRACKED = 7,
  34 #endif
  35 };
  36 
  37 #define NF_CT_STATE_INVALID_BIT                 (1 << 0)
  38 #define NF_CT_STATE_BIT(ctinfo)                 (1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
  39 #define NF_CT_STATE_UNTRACKED_BIT               (1 << 6)
  40 
  41 /* Bitset representing status of connection. */
  42 enum ip_conntrack_status {
  43         /* It's an expected connection: bit 0 set.  This bit never changed */
  44         IPS_EXPECTED_BIT = 0,
  45         IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
  46 
  47         /* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
  48         IPS_SEEN_REPLY_BIT = 1,
  49         IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
  50 
  51         /* Conntrack should never be early-expired. */
  52         IPS_ASSURED_BIT = 2,
  53         IPS_ASSURED = (1 << IPS_ASSURED_BIT),
  54 
  55         /* Connection is confirmed: originating packet has left box */
  56         IPS_CONFIRMED_BIT = 3,
  57         IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
  58 
  59         /* Connection needs src nat in orig dir.  This bit never changed. */
  60         IPS_SRC_NAT_BIT = 4,
  61         IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
  62 
  63         /* Connection needs dst nat in orig dir.  This bit never changed. */
  64         IPS_DST_NAT_BIT = 5,
  65         IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
  66 
  67         /* Both together. */
  68         IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
  69 
  70         /* Connection needs TCP sequence adjusted. */
  71         IPS_SEQ_ADJUST_BIT = 6,
  72         IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
  73 
  74         /* NAT initialization bits. */
  75         IPS_SRC_NAT_DONE_BIT = 7,
  76         IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
  77 
  78         IPS_DST_NAT_DONE_BIT = 8,
  79         IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
  80 
  81         /* Both together */
  82         IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
  83 
  84         /* Connection is dying (removed from lists), can not be unset. */
  85         IPS_DYING_BIT = 9,
  86         IPS_DYING = (1 << IPS_DYING_BIT),
  87 
  88         /* Connection has fixed timeout. */
  89         IPS_FIXED_TIMEOUT_BIT = 10,
  90         IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
  91 
  92         /* Conntrack is a template */
  93         IPS_TEMPLATE_BIT = 11,
  94         IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
  95 
  96         /* Conntrack is a fake untracked entry.  Obsolete and not used anymore */
  97         IPS_UNTRACKED_BIT = 12,
  98         IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
  99 
 100         /* Conntrack got a helper explicitly attached via CT target. */
 101         IPS_HELPER_BIT = 13,
 102         IPS_HELPER = (1 << IPS_HELPER_BIT),
 103 
 104         /* Conntrack has been offloaded to flow table. */
 105         IPS_OFFLOAD_BIT = 14,
 106         IPS_OFFLOAD = (1 << IPS_OFFLOAD_BIT),
 107 
 108         /* Be careful here, modifying these bits can make things messy,
 109          * so don't let users modify them directly.
 110          */
 111         IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
 112                                  IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING |
 113                                  IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_OFFLOAD),
 114 
 115         __IPS_MAX_BIT = 15,
 116 };
 117 
 118 /* Connection tracking event types */
 119 enum ip_conntrack_events {
 120         IPCT_NEW,               /* new conntrack */
 121         IPCT_RELATED,           /* related conntrack */
 122         IPCT_DESTROY,           /* destroyed conntrack */
 123         IPCT_REPLY,             /* connection has seen two-way traffic */
 124         IPCT_ASSURED,           /* connection status has changed to assured */
 125         IPCT_PROTOINFO,         /* protocol information has changed */
 126         IPCT_HELPER,            /* new helper has been set */
 127         IPCT_MARK,              /* new mark has been set */
 128         IPCT_SEQADJ,            /* sequence adjustment has changed */
 129         IPCT_NATSEQADJ = IPCT_SEQADJ,
 130         IPCT_SECMARK,           /* new security mark has been set */
 131         IPCT_LABEL,             /* new connlabel has been set */
 132         IPCT_SYNPROXY,          /* synproxy has been set */
 133 #ifdef __KERNEL__
 134         __IPCT_MAX
 135 #endif
 136 };
 137 
 138 enum ip_conntrack_expect_events {
 139         IPEXP_NEW,              /* new expectation */
 140         IPEXP_DESTROY,          /* destroyed expectation */
 141 };
 142 
 143 /* expectation flags */
 144 #define NF_CT_EXPECT_PERMANENT          0x1
 145 #define NF_CT_EXPECT_INACTIVE           0x2
 146 #define NF_CT_EXPECT_USERSPACE          0x4
 147 
 148 
 149 #endif /* _UAPI_NF_CONNTRACK_COMMON_H */

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