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         struct {
  53                 __be16 key;     /* GRE key is 32bit, PPtP only uses 16bit */
  54         } gre;
  55 };
  56
  57 /* The manipulable part of the tuple. */
  58 struct nf_conntrack_man
  59 {
  60         union nf_conntrack_address u3;
  61         union nf_conntrack_man_proto u;
  62         /* Layer 3 protocol */
  63         u_int16_t l3num;
  64 };
  65
  66 /* This contains the information to distinguish a connection. */
  67 struct nf_conntrack_tuple
  68 {
  69         struct nf_conntrack_man src;
  70
  71         /* These are the parts of the tuple which are fixed. */
  72         struct {
  73                 union nf_conntrack_address u3;
  74                 union {
  75                         /* Add other protocols here. */
  76                         u_int16_t all;
  77
  78                         struct {
  79                                 __be16 port;
  80                         } tcp;
  81                         struct {
  82                                 __be16 port;
  83                         } udp;
  84                         struct {
  85                                 u_int8_t type, code;
  86                         } icmp;
  87                         struct {
  88                                 __be16 port;
  89                         } sctp;
  90                         struct {
  91                                 __be16 key;
  92                         } gre;
  93                 } u;
  94
  95                 /* The protocol. */
  96                 u_int8_t protonum;
  97
  98                 /* The direction (for tuplehash) */
  99                 u_int8_t dir;
 100         } dst;
 101 };
 102
 103 /* This is optimized opposed to a memset of the whole structure.  Everything we
 104  * really care about is the  source/destination unions */
 105 #define NF_CT_TUPLE_U_BLANK(tuple)                                      \
 106         do {                                                            \
 107                 (tuple)->src.u.all = 0;                                 \
 108                 (tuple)->dst.u.all = 0;                                 \
 109                 memset(&(tuple)->src.u3, 0, sizeof((tuple)->src.u3));   \
 110                 memset(&(tuple)->dst.u3, 0, sizeof((tuple)->dst.u3));   \
 111         } while (0)
 112
 113 #ifdef __KERNEL__
 114
 115 #define NF_CT_DUMP_TUPLE(tp)                                                \
 116 DEBUGP("tuple %p: %u %u " NIP6_FMT " %hu -> " NIP6_FMT " %hu\n",            \
 117         (tp), (tp)->src.l3num, (tp)->dst.protonum,                          \
 118         NIP6(*(struct in6_addr *)(tp)->src.u3.all), ntohs((tp)->src.u.all), \
 119         NIP6(*(struct in6_addr *)(tp)->dst.u3.all), ntohs((tp)->dst.u.all))
 120
 121 /* If we're the first tuple, it's the original dir. */
 122 #define NF_CT_DIRECTION(h)                                              \
 123         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 124
 125 /* Connections have two entries in the hash table: one for each way */
 126 struct nf_conntrack_tuple_hash
 127 {
 128         struct list_head list;
 129
 130         struct nf_conntrack_tuple tuple;
 131 };
 132
 133 #endif /* __KERNEL__ */
 134
 135 static inline int nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
 136                                         const struct nf_conntrack_tuple *t2)
 137 {
 138         return (t1->src.u3.all[0] == t2->src.u3.all[0] &&
 139                 t1->src.u3.all[1] == t2->src.u3.all[1] &&
 140                 t1->src.u3.all[2] == t2->src.u3.all[2] &&
 141                 t1->src.u3.all[3] == t2->src.u3.all[3] &&
 142                 t1->src.u.all == t2->src.u.all &&
 143                 t1->src.l3num == t2->src.l3num &&
 144                 t1->dst.protonum == t2->dst.protonum);
 145 }
 146
 147 static inline int nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 148                                         const struct nf_conntrack_tuple *t2)
 149 {
 150         return (t1->dst.u3.all[0] == t2->dst.u3.all[0] &&
 151                 t1->dst.u3.all[1] == t2->dst.u3.all[1] &&
 152                 t1->dst.u3.all[2] == t2->dst.u3.all[2] &&
 153                 t1->dst.u3.all[3] == t2->dst.u3.all[3] &&
 154                 t1->dst.u.all == t2->dst.u.all &&
 155                 t1->src.l3num == t2->src.l3num &&
 156                 t1->dst.protonum == t2->dst.protonum);
 157 }
 158
 159 static inline int nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
 160                                     const struct nf_conntrack_tuple *t2)
 161 {
 162         return nf_ct_tuple_src_equal(t1, t2) && nf_ct_tuple_dst_equal(t1, t2);
 163 }
 164
 165 static inline int nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 166                                        const struct nf_conntrack_tuple *tuple,
 167                                        const struct nf_conntrack_tuple *mask)
 168 {
 169         int count = 0;
 170
 171         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 172                 if ((t->src.u3.all[count] ^ tuple->src.u3.all[count]) &
 173                     mask->src.u3.all[count])
 174                         return 0;
 175         }
 176
 177         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 178                 if ((t->dst.u3.all[count] ^ tuple->dst.u3.all[count]) &
 179                     mask->dst.u3.all[count])
 180                         return 0;
 181         }
 182
 183         if ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all ||
 184             (t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all ||
 185             (t->src.l3num ^ tuple->src.l3num) & mask->src.l3num ||
 186             (t->dst.protonum ^ tuple->dst.protonum) & mask->dst.protonum)
 187                 return 0;
 188
 189         return 1;
 190 }
 191
 192 #endif /* _NF_CONNTRACK_TUPLE_H */