include/linux/netfilter/nf_conntrack_common.h

   1 #ifndef _NF_CONNTRACK_COMMON_H
   2 #define _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 {
   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         /* Number of distinct IP_CT types (no NEW in reply dirn). */
  23         IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
  24 };
  25
  26 /* Bitset representing status of connection. */
  27 enum ip_conntrack_status {
  28         /* It's an expected connection: bit 0 set.  This bit never changed */
  29         IPS_EXPECTED_BIT = 0,
  30         IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
  31
  32         /* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
  33         IPS_SEEN_REPLY_BIT = 1,
  34         IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
  35
  36         /* Conntrack should never be early-expired. */
  37         IPS_ASSURED_BIT = 2,
  38         IPS_ASSURED = (1 << IPS_ASSURED_BIT),
  39
  40         /* Connection is confirmed: originating packet has left box */
  41         IPS_CONFIRMED_BIT = 3,
  42         IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
  43
  44         /* Connection needs src nat in orig dir.  This bit never changed. */
  45         IPS_SRC_NAT_BIT = 4,
  46         IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
  47
  48         /* Connection needs dst nat in orig dir.  This bit never changed. */
  49         IPS_DST_NAT_BIT = 5,
  50         IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
  51
  52         /* Both together. */
  53         IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
  54
  55         /* Connection needs TCP sequence adjusted. */
  56         IPS_SEQ_ADJUST_BIT = 6,
  57         IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
  58
  59         /* NAT initialization bits. */
  60         IPS_SRC_NAT_DONE_BIT = 7,
  61         IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
  62
  63         IPS_DST_NAT_DONE_BIT = 8,
  64         IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
  65
  66         /* Both together */
  67         IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
  68
  69         /* Connection is dying (removed from lists), can not be unset. */
  70         IPS_DYING_BIT = 9,
  71         IPS_DYING = (1 << IPS_DYING_BIT),
  72
  73         /* Connection has fixed timeout. */
  74         IPS_FIXED_TIMEOUT_BIT = 10,
  75         IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
  76 };
  77
  78 /* Connection tracking event bits */
  79 enum ip_conntrack_events
  80 {
  81         /* New conntrack */
  82         IPCT_NEW_BIT = 0,
  83         IPCT_NEW = (1 << IPCT_NEW_BIT),
  84
  85         /* Expected connection */
  86         IPCT_RELATED_BIT = 1,
  87         IPCT_RELATED = (1 << IPCT_RELATED_BIT),
  88
  89         /* Destroyed conntrack */
  90         IPCT_DESTROY_BIT = 2,
  91         IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
  92
  93         /* Timer has been refreshed */
  94         IPCT_REFRESH_BIT = 3,
  95         IPCT_REFRESH = (1 << IPCT_REFRESH_BIT),
  96
  97         /* Status has changed */
  98         IPCT_STATUS_BIT = 4,
  99         IPCT_STATUS = (1 << IPCT_STATUS_BIT),
 100
 101         /* Update of protocol info */
 102         IPCT_PROTOINFO_BIT = 5,
 103         IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
 104
 105         /* Volatile protocol info */
 106         IPCT_PROTOINFO_VOLATILE_BIT = 6,
 107         IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT),
 108
 109         /* New helper for conntrack */
 110         IPCT_HELPER_BIT = 7,
 111         IPCT_HELPER = (1 << IPCT_HELPER_BIT),
 112
 113         /* Update of helper info */
 114         IPCT_HELPINFO_BIT = 8,
 115         IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT),
 116
 117         /* Volatile helper info */
 118         IPCT_HELPINFO_VOLATILE_BIT = 9,
 119         IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT),
 120
 121         /* NAT info */
 122         IPCT_NATINFO_BIT = 10,
 123         IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
 124
 125         /* Counter highest bit has been set, unused */
 126         IPCT_COUNTER_FILLING_BIT = 11,
 127         IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
 128
 129         /* Mark is set */
 130         IPCT_MARK_BIT = 12,
 131         IPCT_MARK = (1 << IPCT_MARK_BIT),
 132
 133         /* NAT sequence adjustment */
 134         IPCT_NATSEQADJ_BIT = 13,
 135         IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
 136
 137         /* Secmark is set */
 138         IPCT_SECMARK_BIT = 14,
 139         IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
 140 };
 141
 142 enum ip_conntrack_expect_events {
 143         IPEXP_NEW_BIT = 0,
 144         IPEXP_NEW = (1 << IPEXP_NEW_BIT),
 145 };
 146
 147 #ifdef __KERNEL__
 148 struct ip_conntrack_stat
 149 {
 150         unsigned int searched;
 151         unsigned int found;
 152         unsigned int new;
 153         unsigned int invalid;
 154         unsigned int ignore;
 155         unsigned int delete;
 156         unsigned int delete_list;
 157         unsigned int insert;
 158         unsigned int insert_failed;
 159         unsigned int drop;
 160         unsigned int early_drop;
 161         unsigned int error;
 162         unsigned int expect_new;
 163         unsigned int expect_create;
 164         unsigned int expect_delete;
 165 };
 166
 167 /* call to create an explicit dependency on nf_conntrack. */
 168 extern void need_conntrack(void);
 169
 170 #endif /* __KERNEL__ */
 171
 172 #endif /* _NF_CONNTRACK_COMMON_H */