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/x_tables.h>
  14 #include <linux/netfilter/nf_conntrack_tuple_common.h>
  15
  16 /* A `tuple' is a structure containing the information to uniquely
  17   identify a connection.  ie. if two packets have the same tuple, they
  18   are in the same connection; if not, they are not.
  19
  20   We divide the structure along "manipulatable" and
  21   "non-manipulatable" lines, for the benefit of the NAT code.
  22 */
  23
  24 #define NF_CT_TUPLE_L3SIZE      ARRAY_SIZE(((union nf_inet_addr *)NULL)->all)
  25
  26 /* The protocol-specific manipulable parts of the tuple: always in
  27    network order! */
  28 union nf_conntrack_man_proto
  29 {
  30         /* Add other protocols here. */
  31         __be16 all;
  32
  33         struct {
  34                 __be16 port;
  35         } tcp;
  36         struct {
  37                 __be16 port;
  38         } udp;
  39         struct {
  40                 __be16 id;
  41         } icmp;
  42         struct {
  43                 __be16 port;
  44         } sctp;
  45         struct {
  46                 __be16 key;     /* GRE key is 32bit, PPtP only uses 16bit */
  47         } gre;
  48 };
  49
  50 /* The manipulable part of the tuple. */
  51 struct nf_conntrack_man
  52 {
  53         union nf_inet_addr u3;
  54         union nf_conntrack_man_proto u;
  55         /* Layer 3 protocol */
  56         u_int16_t l3num;
  57 };
  58
  59 /* This contains the information to distinguish a connection. */
  60 struct nf_conntrack_tuple
  61 {
  62         struct nf_conntrack_man src;
  63
  64         /* These are the parts of the tuple which are fixed. */
  65         struct {
  66                 union nf_inet_addr u3;
  67                 union {
  68                         /* Add other protocols here. */
  69                         __be16 all;
  70
  71                         struct {
  72                                 __be16 port;
  73                         } tcp;
  74                         struct {
  75                                 __be16 port;
  76                         } udp;
  77                         struct {
  78                                 u_int8_t type, code;
  79                         } icmp;
  80                         struct {
  81                                 __be16 port;
  82                         } sctp;
  83                         struct {
  84                                 __be16 key;
  85                         } gre;
  86                 } u;
  87
  88                 /* The protocol. */
  89                 u_int8_t protonum;
  90
  91                 /* The direction (for tuplehash) */
  92                 u_int8_t dir;
  93         } dst;
  94 };
  95
  96 struct nf_conntrack_tuple_mask
  97 {
  98         struct {
  99                 union nf_inet_addr u3;
 100                 union nf_conntrack_man_proto u;
 101         } src;
 102 };
 103
 104 /* This is optimized opposed to a memset of the whole structure.  Everything we
 105  * really care about is the  source/destination unions */
 106 #define NF_CT_TUPLE_U_BLANK(tuple)                                      \
 107         do {                                                            \
 108                 (tuple)->src.u.all = 0;                                 \
 109                 (tuple)->dst.u.all = 0;                                 \
 110                 memset(&(tuple)->src.u3, 0, sizeof((tuple)->src.u3));   \
 111                 memset(&(tuple)->dst.u3, 0, sizeof((tuple)->dst.u3));   \
 112         } while (0)
 113
 114 #ifdef __KERNEL__
 115
 116 #define NF_CT_DUMP_TUPLE(tp)                                                 \
 117 pr_debug("tuple %p: %u %u " NIP6_FMT " %hu -> " NIP6_FMT " %hu\n",           \
 118          (tp), (tp)->src.l3num, (tp)->dst.protonum,                          \
 119          NIP6(*(struct in6_addr *)(tp)->src.u3.all), ntohs((tp)->src.u.all), \
 120          NIP6(*(struct in6_addr *)(tp)->dst.u3.all), ntohs((tp)->dst.u.all))
 121
 122 /* If we're the first tuple, it's the original dir. */
 123 #define NF_CT_DIRECTION(h)                                              \
 124         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 125
 126 /* Connections have two entries in the hash table: one for each way */
 127 struct nf_conntrack_tuple_hash
 128 {
 129         struct hlist_node hnode;
 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 }
 145
 146 static inline int __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 147                                           const struct nf_conntrack_tuple *t2)
 148 {
 149         return (t1->dst.u3.all[0] == t2->dst.u3.all[0] &&
 150                 t1->dst.u3.all[1] == t2->dst.u3.all[1] &&
 151                 t1->dst.u3.all[2] == t2->dst.u3.all[2] &&
 152                 t1->dst.u3.all[3] == t2->dst.u3.all[3] &&
 153                 t1->dst.u.all == t2->dst.u.all &&
 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) &&
 161                __nf_ct_tuple_dst_equal(t1, t2);
 162 }
 163
 164 static inline int nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
 165                                          const struct nf_conntrack_tuple_mask *m2)
 166 {
 167         return (m1->src.u3.all[0] == m2->src.u3.all[0] &&
 168                 m1->src.u3.all[1] == m2->src.u3.all[1] &&
 169                 m1->src.u3.all[2] == m2->src.u3.all[2] &&
 170                 m1->src.u3.all[3] == m2->src.u3.all[3] &&
 171                 m1->src.u.all == m2->src.u.all);
 172 }
 173
 174 static inline int nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
 175                                            const struct nf_conntrack_tuple *t2,
 176                                            const struct nf_conntrack_tuple_mask *mask)
 177 {
 178         int count;
 179
 180         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
 181                 if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
 182                     mask->src.u3.all[count])
 183                         return 0;
 184         }
 185
 186         if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
 187                 return 0;
 188
 189         if (t1->src.l3num != t2->src.l3num ||
 190             t1->dst.protonum != t2->dst.protonum)
 191                 return 0;
 192
 193         return 1;
 194 }
 195
 196 static inline int nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 197                                        const struct nf_conntrack_tuple *tuple,
 198                                        const struct nf_conntrack_tuple_mask *mask)
 199 {
 200         return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
 201                __nf_ct_tuple_dst_equal(t, tuple);
 202 }
 203
 204 #endif /* _NF_CONNTRACK_TUPLE_H */