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_man_l3proto {
  28         u_int32_t all[NF_CT_TUPLE_L3SIZE];
  29         u_int32_t ip;
  30         u_int32_t 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                 u_int16_t port;
  42         } tcp;
  43         struct {
  44                 u_int16_t port;
  45         } udp;
  46         struct {
  47                 u_int16_t id;
  48         } icmp;
  49         struct {
  50                 u_int16_t port;
  51         } sctp;
  52 };
  53
  54 /* The manipulable part of the tuple. */
  55 struct nf_conntrack_man
  56 {
  57         union nf_conntrack_man_l3proto 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 {
  71                         u_int32_t all[NF_CT_TUPLE_L3SIZE];
  72                         u_int32_t ip;
  73                         u_int32_t ip6[4];
  74                 } u3;
  75                 union {
  76                         /* Add other protocols here. */
  77                         u_int16_t all;
  78
  79                         struct {
  80                                 u_int16_t port;
  81                         } tcp;
  82                         struct {
  83                                 u_int16_t port;
  84                         } udp;
  85                         struct {
  86                                 u_int8_t type, code;
  87                         } icmp;
  88                         struct {
  89                                 u_int16_t port;
  90                         } sctp;
  91                 } u;
  92
  93                 /* The protocol. */
  94                 u_int8_t protonum;
  95
  96                 /* The direction (for tuplehash) */
  97                 u_int8_t dir;
  98         } dst;
  99 };
 100
 101 /* This is optimized opposed to a memset of the whole structure.  Everything we
 102  * really care about is the  source/destination unions */
 103 #define NF_CT_TUPLE_U_BLANK(tuple)                                      \
 104         do {                                                            \
 105                 (tuple)->src.u.all = 0;                                 \
 106                 (tuple)->dst.u.all = 0;                                 \
 107                 memset(&(tuple)->src.u3, 0, sizeof((tuple)->src.u3));   \
 108                 memset(&(tuple)->dst.u3, 0, sizeof((tuple)->dst.u3));   \
 109         } while (0)
 110
 111 #ifdef __KERNEL__
 112
 113 #define NF_CT_DUMP_TUPLE(tp)                                                \
 114 DEBUGP("tuple %p: %u %u " NIP6_FMT " %hu -> " NIP6_FMT " %hu\n",            \
 115         (tp), (tp)->src.l3num, (tp)->dst.protonum,                          \
 116         NIP6(*(struct in6_addr *)(tp)->src.u3.all), ntohs((tp)->src.u.all), \
 117         NIP6(*(struct in6_addr *)(tp)->dst.u3.all), ntohs((tp)->dst.u.all))
 118
 119 /* If we're the first tuple, it's the original dir. */
 120 #define NF_CT_DIRECTION(h)                                              \
 121         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 122
 123 /* Connections have two entries in the hash table: one for each way */
 124 struct nf_conntrack_tuple_hash
 125 {
 126         struct list_head list;
 127
 128         struct nf_conntrack_tuple tuple;
 129 };
 130
 131 #endif /* __KERNEL__ */
 132
 133 static inline int nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
 134                                         const struct nf_conntrack_tuple *t2)
 135 {
 136         return (t1->src.u3.all[0] == t2->src.u3.all[0] &&
 137                 t1->src.u3.all[1] == t2->src.u3.all[1] &&
 138                 t1->src.u3.all[2] == t2->src.u3.all[2] &&
 139                 t1->src.u3.all[3] == t2->src.u3.all[3] &&
 140                 t1->src.u.all == t2->src.u.all &&
 141                 t1->src.l3num == t2->src.l3num &&
 142                 t1->dst.protonum == t2->dst.protonum);
 143 }
 144
 145 static inline int nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 146                                         const struct nf_conntrack_tuple *t2)
 147 {
 148         return (t1->dst.u3.all[0] == t2->dst.u3.all[0] &&
 149                 t1->dst.u3.all[1] == t2->dst.u3.all[1] &&
 150                 t1->dst.u3.all[2] == t2->dst.u3.all[2] &&
 151                 t1->dst.u3.all[3] == t2->dst.u3.all[3] &&
 152                 t1->dst.u.all == t2->dst.u.all &&
 153                 t1->src.l3num == t2->src.l3num &&
 154                 t1->dst.protonum == t2->dst.protonum);
 155 }
 156
 157 static inline int nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
 158                                     const struct nf_conntrack_tuple *t2)
 159 {
 160         return nf_ct_tuple_src_equal(t1, t2) && nf_ct_tuple_dst_equal(t1, t2);
 161 }
 162
 163 static inline int nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 164                                        const struct nf_conntrack_tuple *tuple,
 165                                        const struct nf_conntrack_tuple *mask)
 166 {
 167         int count = 0;
 168
 169         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 170                 if ((t->src.u3.all[count] ^ tuple->src.u3.all[count]) &
 171                     mask->src.u3.all[count])
 172                         return 0;
 173         }
 174
 175         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 176                 if ((t->dst.u3.all[count] ^ tuple->dst.u3.all[count]) &
 177                     mask->dst.u3.all[count])
 178                         return 0;
 179         }
 180
 181         if ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all ||
 182             (t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all ||
 183             (t->src.l3num ^ tuple->src.l3num) & mask->src.l3num ||
 184             (t->dst.protonum ^ tuple->dst.protonum) & mask->dst.protonum)
 185                 return 0;
 186
 187         return 1;
 188 }
 189
 190 #endif /* _NF_CONNTRACK_TUPLE_H */