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 protocol-specific manipulable parts of the tuple: always in
  28    network order! */
  29 union nf_conntrack_man_proto {
  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         } dccp;
  45         struct {
  46                 __be16 port;
  47         } sctp;
  48         struct {
  49                 __be16 key;     /* GRE key is 32bit, PPtP only uses 16bit */
  50         } gre;
  51 };
  52
  53 /* The manipulable part of the tuple. */
  54 struct nf_conntrack_man {
  55         union nf_inet_addr u3;
  56         union nf_conntrack_man_proto u;
  57         /* Layer 3 protocol */
  58         u_int16_t l3num;
  59 };
  60
  61 /* This contains the information to distinguish a connection. */
  62 struct nf_conntrack_tuple {
  63         struct nf_conntrack_man src;
  64
  65         /* These are the parts of the tuple which are fixed. */
  66         struct {
  67                 union nf_inet_addr u3;
  68                 union {
  69                         /* Add other protocols here. */
  70                         __be16 all;
  71
  72                         struct {
  73                                 __be16 port;
  74                         } tcp;
  75                         struct {
  76                                 __be16 port;
  77                         } udp;
  78                         struct {
  79                                 u_int8_t type, code;
  80                         } icmp;
  81                         struct {
  82                                 __be16 port;
  83                         } dccp;
  84                         struct {
  85                                 __be16 port;
  86                         } sctp;
  87                         struct {
  88                                 __be16 key;
  89                         } gre;
  90                 } u;
  91
  92                 /* The protocol. */
  93                 u_int8_t protonum;
  94
  95                 /* The direction (for tuplehash) */
  96                 u_int8_t dir;
  97         } dst;
  98 };
  99
 100 struct nf_conntrack_tuple_mask {
 101         struct {
 102                 union nf_inet_addr u3;
 103                 union nf_conntrack_man_proto u;
 104         } src;
 105 };
 106
 107 #ifdef __KERNEL__
 108
 109 static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
 110 {
 111 #ifdef DEBUG
 112         printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
 113                t, t->dst.protonum,
 114                &t->src.u3.ip, ntohs(t->src.u.all),
 115                &t->dst.u3.ip, ntohs(t->dst.u.all));
 116 #endif
 117 }
 118
 119 static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
 120 {
 121 #ifdef DEBUG
 122         printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
 123                t, t->dst.protonum,
 124                t->src.u3.all, ntohs(t->src.u.all),
 125                t->dst.u3.all, ntohs(t->dst.u.all));
 126 #endif
 127 }
 128
 129 static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
 130 {
 131         switch (t->src.l3num) {
 132         case AF_INET:
 133                 nf_ct_dump_tuple_ip(t);
 134                 break;
 135         case AF_INET6:
 136                 nf_ct_dump_tuple_ipv6(t);
 137                 break;
 138         }
 139 }
 140
 141 /* If we're the first tuple, it's the original dir. */
 142 #define NF_CT_DIRECTION(h)                                              \
 143         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 144
 145 /* Connections have two entries in the hash table: one for each way */
 146 struct nf_conntrack_tuple_hash {
 147         struct hlist_nulls_node hnnode;
 148         struct nf_conntrack_tuple tuple;
 149 };
 150
 151 #endif /* __KERNEL__ */
 152
 153 static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
 154                                            const struct nf_conntrack_tuple *t2)
 155 {
 156         return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
 157                 t1->src.u.all == t2->src.u.all &&
 158                 t1->src.l3num == t2->src.l3num);
 159 }
 160
 161 static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 162                                            const struct nf_conntrack_tuple *t2)
 163 {
 164         return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
 165                 t1->dst.u.all == t2->dst.u.all &&
 166                 t1->dst.protonum == t2->dst.protonum);
 167 }
 168
 169 static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
 170                                      const struct nf_conntrack_tuple *t2)
 171 {
 172         return __nf_ct_tuple_src_equal(t1, t2) &&
 173                __nf_ct_tuple_dst_equal(t1, t2);
 174 }
 175
 176 static inline bool
 177 nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
 178                        const struct nf_conntrack_tuple_mask *m2)
 179 {
 180         return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
 181                 m1->src.u.all == m2->src.u.all);
 182 }
 183
 184 static inline bool
 185 nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
 186                          const struct nf_conntrack_tuple *t2,
 187                          const struct nf_conntrack_tuple_mask *mask)
 188 {
 189         int count;
 190
 191         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
 192                 if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
 193                     mask->src.u3.all[count])
 194                         return false;
 195         }
 196
 197         if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
 198                 return false;
 199
 200         if (t1->src.l3num != t2->src.l3num ||
 201             t1->dst.protonum != t2->dst.protonum)
 202                 return false;
 203
 204         return true;
 205 }
 206
 207 static inline bool
 208 nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 209                      const struct nf_conntrack_tuple *tuple,
 210                      const struct nf_conntrack_tuple_mask *mask)
 211 {
 212         return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
 213                __nf_ct_tuple_dst_equal(t, tuple);
 214 }
 215
 216 #endif /* _NF_CONNTRACK_TUPLE_H */