include/net/netfilter/nf_conntrack_tuple.h

   1 /*
   2  * Definitions and Declarations for tuple.
   3  *
   4  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
   5  *      - generalize L3 protocol dependent part.
   6  *
   7  * Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h
   8  */
   9
  10 #ifndef _NF_CONNTRACK_TUPLE_H
  11 #define _NF_CONNTRACK_TUPLE_H
  12
  13 #include <linux/netfilter/nf_conntrack_tuple_common.h>
  14
  15 /* A `tuple' is a structure containing the information to uniquely
  16   identify a connection.  ie. if two packets have the same tuple, they
  17   are in the same connection; if not, they are not.
  18
  19   We divide the structure along "manipulatable" and
  20   "non-manipulatable" lines, for the benefit of the NAT code.
  21 */
  22
  23 #define NF_CT_TUPLE_L3SIZE      4
  24
  25 /* The l3 protocol-specific manipulable parts of the tuple: always in
  26    network order! */
  27 union nf_conntrack_address {
  28         u_int32_t all[NF_CT_TUPLE_L3SIZE];
  29         __be32 ip;
  30         __be32 ip6[4];
  31 };
  32
  33 /* The protocol-specific manipulable parts of the tuple: always in
  34    network order! */
  35 union nf_conntrack_man_proto
  36 {
  37         /* Add other protocols here. */
  38         u_int16_t all;
  39
  40         struct {
  41                 __be16 port;
  42         } tcp;
  43         struct {
  44                 __be16 port;
  45         } udp;
  46         struct {
  47                 __be16 id;
  48         } icmp;
  49         struct {
  50                 __be16 port;
  51         } sctp;
  52 };
  53
  54 /* The manipulable part of the tuple. */
  55 struct nf_conntrack_man
  56 {
  57         union nf_conntrack_address u3;
  58         union nf_conntrack_man_proto u;
  59         /* Layer 3 protocol */
  60         u_int16_t l3num;
  61 };
  62
  63 /* This contains the information to distinguish a connection. */
  64 struct nf_conntrack_tuple
  65 {
  66         struct nf_conntrack_man src;
  67
  68         /* These are the parts of the tuple which are fixed. */
  69         struct {
  70                 union nf_conntrack_address u3;
  71                 union {
  72                         /* Add other protocols here. */
  73                         u_int16_t all;
  74
  75                         struct {
  76                                 __be16 port;
  77                         } tcp;
  78                         struct {
  79                                 __be16 port;
  80                         } udp;
  81                         struct {
  82                                 u_int8_t type, code;
  83                         } icmp;
  84                         struct {
  85                                 __be16 port;
  86                         } sctp;
  87                 } u;
  88
  89                 /* The protocol. */
  90                 u_int8_t protonum;
  91
  92                 /* The direction (for tuplehash) */
  93                 u_int8_t dir;
  94         } dst;
  95 };
  96
  97 /* This is optimized opposed to a memset of the whole structure.  Everything we
  98  * really care about is the  source/destination unions */
  99 #define NF_CT_TUPLE_U_BLANK(tuple)                                      \
 100         do {                                                            \
 101                 (tuple)->src.u.all = 0;                                 \
 102                 (tuple)->dst.u.all = 0;                                 \
 103                 memset(&(tuple)->src.u3, 0, sizeof((tuple)->src.u3));   \
 104                 memset(&(tuple)->dst.u3, 0, sizeof((tuple)->dst.u3));   \
 105         } while (0)
 106
 107 #ifdef __KERNEL__
 108
 109 #define NF_CT_DUMP_TUPLE(tp)                                                \
 110 DEBUGP("tuple %p: %u %u " NIP6_FMT " %hu -> " NIP6_FMT " %hu\n",            \
 111         (tp), (tp)->src.l3num, (tp)->dst.protonum,                          \
 112         NIP6(*(struct in6_addr *)(tp)->src.u3.all), ntohs((tp)->src.u.all), \
 113         NIP6(*(struct in6_addr *)(tp)->dst.u3.all), ntohs((tp)->dst.u.all))
 114
 115 /* If we're the first tuple, it's the original dir. */
 116 #define NF_CT_DIRECTION(h)                                              \
 117         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 118
 119 /* Connections have two entries in the hash table: one for each way */
 120 struct nf_conntrack_tuple_hash
 121 {
 122         struct list_head list;
 123
 124         struct nf_conntrack_tuple tuple;
 125 };
 126
 127 #endif /* __KERNEL__ */
 128
 129 static inline int nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
 130                                         const struct nf_conntrack_tuple *t2)
 131 {
 132         return (t1->src.u3.all[0] == t2->src.u3.all[0] &&
 133                 t1->src.u3.all[1] == t2->src.u3.all[1] &&
 134                 t1->src.u3.all[2] == t2->src.u3.all[2] &&
 135                 t1->src.u3.all[3] == t2->src.u3.all[3] &&
 136                 t1->src.u.all == t2->src.u.all &&
 137                 t1->src.l3num == t2->src.l3num &&
 138                 t1->dst.protonum == t2->dst.protonum);
 139 }
 140
 141 static inline int nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 142                                         const struct nf_conntrack_tuple *t2)
 143 {
 144         return (t1->dst.u3.all[0] == t2->dst.u3.all[0] &&
 145                 t1->dst.u3.all[1] == t2->dst.u3.all[1] &&
 146                 t1->dst.u3.all[2] == t2->dst.u3.all[2] &&
 147                 t1->dst.u3.all[3] == t2->dst.u3.all[3] &&
 148                 t1->dst.u.all == t2->dst.u.all &&
 149                 t1->src.l3num == t2->src.l3num &&
 150                 t1->dst.protonum == t2->dst.protonum);
 151 }
 152
 153 static inline int nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
 154                                     const struct nf_conntrack_tuple *t2)
 155 {
 156         return nf_ct_tuple_src_equal(t1, t2) && nf_ct_tuple_dst_equal(t1, t2);
 157 }
 158
 159 static inline int nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 160                                        const struct nf_conntrack_tuple *tuple,
 161                                        const struct nf_conntrack_tuple *mask)
 162 {
 163         int count = 0;
 164
 165         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 166                 if ((t->src.u3.all[count] ^ tuple->src.u3.all[count]) &
 167                     mask->src.u3.all[count])
 168                         return 0;
 169         }
 170
 171         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 172                 if ((t->dst.u3.all[count] ^ tuple->dst.u3.all[count]) &
 173                     mask->dst.u3.all[count])
 174                         return 0;
 175         }
 176
 177         if ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all ||
 178             (t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all ||
 179             (t->src.l3num ^ tuple->src.l3num) & mask->src.l3num ||
 180             (t->dst.protonum ^ tuple->dst.protonum) & mask->dst.protonum)
 181                 return 0;
 182
 183         return 1;
 184 }
 185
 186 #endif /* _NF_CONNTRACK_TUPLE_H */