include/linux/netfilter_ipv4/ip_conntrack_tuple.h

   1 #ifndef _IP_CONNTRACK_TUPLE_H
   2 #define _IP_CONNTRACK_TUPLE_H
   3
   4 #include <linux/types.h>
   5 #include <linux/netfilter/nf_conntrack_tuple_common.h>
   6
   7 /* A `tuple' is a structure containing the information to uniquely
   8   identify a connection.  ie. if two packets have the same tuple, they
   9   are in the same connection; if not, they are not.
  10
  11   We divide the structure along "manipulatable" and
  12   "non-manipulatable" lines, for the benefit of the NAT code.
  13 */
  14
  15 /* The protocol-specific manipulable parts of the tuple: always in
  16    network order! */
  17 union ip_conntrack_manip_proto
  18 {
  19         /* Add other protocols here. */
  20         u_int16_t all;
  21
  22         struct {
  23                 __be16 port;
  24         } tcp;
  25         struct {
  26                 __be16 port;
  27         } udp;
  28         struct {
  29                 __be16 id;
  30         } icmp;
  31         struct {
  32                 __be16 port;
  33         } sctp;
  34         struct {
  35                 __be16 key;     /* key is 32bit, pptp only uses 16 */
  36         } gre;
  37 };
  38
  39 /* The manipulable part of the tuple. */
  40 struct ip_conntrack_manip
  41 {
  42         __be32 ip;
  43         union ip_conntrack_manip_proto u;
  44 };
  45
  46 /* This contains the information to distinguish a connection. */
  47 struct ip_conntrack_tuple
  48 {
  49         struct ip_conntrack_manip src;
  50
  51         /* These are the parts of the tuple which are fixed. */
  52         struct {
  53                 __be32 ip;
  54                 union {
  55                         /* Add other protocols here. */
  56                         u_int16_t all;
  57
  58                         struct {
  59                                 __be16 port;
  60                         } tcp;
  61                         struct {
  62                                 __be16 port;
  63                         } udp;
  64                         struct {
  65                                 u_int8_t type, code;
  66                         } icmp;
  67                         struct {
  68                                 __be16 port;
  69                         } sctp;
  70                         struct {
  71                                 __be16 key;     /* key is 32bit,
  72                                                  * pptp only uses 16 */
  73                         } gre;
  74                 } u;
  75
  76                 /* The protocol. */
  77                 u_int8_t protonum;
  78
  79                 /* The direction (for tuplehash) */
  80                 u_int8_t dir;
  81         } dst;
  82 };
  83
  84 /* This is optimized opposed to a memset of the whole structure.  Everything we
  85  * really care about is the  source/destination unions */
  86 #define IP_CT_TUPLE_U_BLANK(tuple)                              \
  87         do {                                                    \
  88                 (tuple)->src.u.all = 0;                         \
  89                 (tuple)->dst.u.all = 0;                         \
  90         } while (0)
  91
  92 #ifdef __KERNEL__
  93
  94 #define DUMP_TUPLE(tp)                                          \
  95 DEBUGP("tuple %p: %u %u.%u.%u.%u:%hu -> %u.%u.%u.%u:%hu\n",     \
  96        (tp), (tp)->dst.protonum,                                \
  97        NIPQUAD((tp)->src.ip), ntohs((tp)->src.u.all),           \
  98        NIPQUAD((tp)->dst.ip), ntohs((tp)->dst.u.all))
  99
 100 /* If we're the first tuple, it's the original dir. */
 101 #define DIRECTION(h) ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 102
 103 /* Connections have two entries in the hash table: one for each way */
 104 struct ip_conntrack_tuple_hash
 105 {
 106         struct list_head list;
 107
 108         struct ip_conntrack_tuple tuple;
 109 };
 110
 111 #endif /* __KERNEL__ */
 112
 113 static inline int ip_ct_tuple_src_equal(const struct ip_conntrack_tuple *t1,
 114                                         const struct ip_conntrack_tuple *t2)
 115 {
 116         return t1->src.ip == t2->src.ip
 117                 && t1->src.u.all == t2->src.u.all;
 118 }
 119
 120 static inline int ip_ct_tuple_dst_equal(const struct ip_conntrack_tuple *t1,
 121                                         const struct ip_conntrack_tuple *t2)
 122 {
 123         return t1->dst.ip == t2->dst.ip
 124                 && t1->dst.u.all == t2->dst.u.all
 125                 && t1->dst.protonum == t2->dst.protonum;
 126 }
 127
 128 static inline int ip_ct_tuple_equal(const struct ip_conntrack_tuple *t1,
 129                                     const struct ip_conntrack_tuple *t2)
 130 {
 131         return ip_ct_tuple_src_equal(t1, t2) && ip_ct_tuple_dst_equal(t1, t2);
 132 }
 133
 134 static inline int ip_ct_tuple_mask_cmp(const struct ip_conntrack_tuple *t,
 135                                        const struct ip_conntrack_tuple *tuple,
 136                                        const struct ip_conntrack_tuple *mask)
 137 {
 138         return !(((t->src.ip ^ tuple->src.ip) & mask->src.ip)
 139                  || ((t->dst.ip ^ tuple->dst.ip) & mask->dst.ip)
 140                  || ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all)
 141                  || ((t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all)
 142                  || ((t->dst.protonum ^ tuple->dst.protonum)
 143                      & mask->dst.protonum));
 144 }
 145
 146 #endif /* _IP_CONNTRACK_TUPLE_H */