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 #include <linux/list_nulls.h>
  16
  17 /* A `tuple' is a structure containing the information to uniquely
  18   identify a connection.  ie. if two packets have the same tuple, they
  19   are in the same connection; if not, they are not.
  20
  21   We divide the structure along "manipulatable" and
  22   "non-manipulatable" lines, for the benefit of the NAT code.
  23 */
  24
  25 #define NF_CT_TUPLE_L3SIZE      ARRAY_SIZE(((union nf_inet_addr *)NULL)->all)
  26
  27 /* The manipulable part of the tuple. */
  28 struct nf_conntrack_man {
  29         union nf_inet_addr u3;
  30         union nf_conntrack_man_proto u;
  31         /* Layer 3 protocol */
  32         u_int16_t l3num;
  33 };
  34
  35 /* This contains the information to distinguish a connection. */
  36 struct nf_conntrack_tuple {
  37         struct nf_conntrack_man src;
  38
  39         /* These are the parts of the tuple which are fixed. */
  40         struct {
  41                 union nf_inet_addr u3;
  42                 union {
  43                         /* Add other protocols here. */
  44                         __be16 all;
  45
  46                         struct {
  47                                 __be16 port;
  48                         } tcp;
  49                         struct {
  50                                 __be16 port;
  51                         } udp;
  52                         struct {
  53                                 u_int8_t type, code;
  54                         } icmp;
  55                         struct {
  56                                 __be16 port;
  57                         } dccp;
  58                         struct {
  59                                 __be16 port;
  60                         } sctp;
  61                         struct {
  62                                 __be16 key;
  63                         } gre;
  64                 } u;
  65
  66                 /* The protocol. */
  67                 u_int8_t protonum;
  68
  69                 /* The direction (for tuplehash) */
  70                 u_int8_t dir;
  71         } dst;
  72 };
  73
  74 struct nf_conntrack_tuple_mask {
  75         struct {
  76                 union nf_inet_addr u3;
  77                 union nf_conntrack_man_proto u;
  78         } src;
  79 };
  80
  81 static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
  82 {
  83 #ifdef DEBUG
  84         printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
  85                t, t->dst.protonum,
  86                &t->src.u3.ip, ntohs(t->src.u.all),
  87                &t->dst.u3.ip, ntohs(t->dst.u.all));
  88 #endif
  89 }
  90
  91 static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
  92 {
  93 #ifdef DEBUG
  94         printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
  95                t, t->dst.protonum,
  96                t->src.u3.all, ntohs(t->src.u.all),
  97                t->dst.u3.all, ntohs(t->dst.u.all));
  98 #endif
  99 }
 100
 101 static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
 102 {
 103         switch (t->src.l3num) {
 104         case AF_INET:
 105                 nf_ct_dump_tuple_ip(t);
 106                 break;
 107         case AF_INET6:
 108                 nf_ct_dump_tuple_ipv6(t);
 109                 break;
 110         }
 111 }
 112
 113 /* If we're the first tuple, it's the original dir. */
 114 #define NF_CT_DIRECTION(h)                                              \
 115         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 116
 117 /* Connections have two entries in the hash table: one for each way */
 118 struct nf_conntrack_tuple_hash {
 119         struct hlist_nulls_node hnnode;
 120         struct nf_conntrack_tuple tuple;
 121 };
 122
 123 static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
 124                                            const struct nf_conntrack_tuple *t2)
 125 {
 126         return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
 127                 t1->src.u.all == t2->src.u.all &&
 128                 t1->src.l3num == t2->src.l3num);
 129 }
 130
 131 static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 132                                            const struct nf_conntrack_tuple *t2)
 133 {
 134         return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
 135                 t1->dst.u.all == t2->dst.u.all &&
 136                 t1->dst.protonum == t2->dst.protonum);
 137 }
 138
 139 static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
 140                                      const struct nf_conntrack_tuple *t2)
 141 {
 142         return __nf_ct_tuple_src_equal(t1, t2) &&
 143                __nf_ct_tuple_dst_equal(t1, t2);
 144 }
 145
 146 static inline bool
 147 nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
 148                        const struct nf_conntrack_tuple_mask *m2)
 149 {
 150         return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
 151                 m1->src.u.all == m2->src.u.all);
 152 }
 153
 154 static inline bool
 155 nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
 156                          const struct nf_conntrack_tuple *t2,
 157                          const struct nf_conntrack_tuple_mask *mask)
 158 {
 159         int count;
 160
 161         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
 162                 if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
 163                     mask->src.u3.all[count])
 164                         return false;
 165         }
 166
 167         if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
 168                 return false;
 169
 170         if (t1->src.l3num != t2->src.l3num ||
 171             t1->dst.protonum != t2->dst.protonum)
 172                 return false;
 173
 174         return true;
 175 }
 176
 177 static inline bool
 178 nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 179                      const struct nf_conntrack_tuple *tuple,
 180                      const struct nf_conntrack_tuple_mask *mask)
 181 {
 182         return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
 183                __nf_ct_tuple_dst_equal(t, tuple);
 184 }
 185
 186 #endif /* _NF_CONNTRACK_TUPLE_H */