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 {
  31         /* Add other protocols here. */
  32         __be16 all;
  33
  34         struct {
  35                 __be16 port;
  36         } tcp;
  37         struct {
  38                 __be16 port;
  39         } udp;
  40         struct {
  41                 __be16 id;
  42         } icmp;
  43         struct {
  44                 __be16 port;
  45         } dccp;
  46         struct {
  47                 __be16 port;
  48         } sctp;
  49         struct {
  50                 __be16 key;     /* GRE key is 32bit, PPtP only uses 16bit */
  51         } gre;
  52 };
  53
  54 /* The manipulable part of the tuple. */
  55 struct nf_conntrack_man
  56 {
  57         union nf_inet_addr 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 nf_inet_addr u3;
  71                 union {
  72                         /* Add other protocols here. */
  73                         __be16 all;
  74
  75                         struct {
  76                                 __be16 port;
  77                         } tcp;
  78                         struct {
  79                                 __be16 port;
  80                         } udp;
  81                         struct {
  82                                 u_int8_t type, code;
  83                         } icmp;
  84                         struct {
  85                                 __be16 port;
  86                         } dccp;
  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 struct nf_conntrack_tuple_mask
 104 {
 105         struct {
 106                 union nf_inet_addr u3;
 107                 union nf_conntrack_man_proto u;
 108         } src;
 109 };
 110
 111 #ifdef __KERNEL__
 112
 113 static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
 114 {
 115 #ifdef DEBUG
 116         printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
 117                t, t->dst.protonum,
 118                &t->src.u3.ip, ntohs(t->src.u.all),
 119                &t->dst.u3.ip, ntohs(t->dst.u.all));
 120 #endif
 121 }
 122
 123 static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
 124 {
 125 #ifdef DEBUG
 126         printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
 127                t, t->dst.protonum,
 128                t->src.u3.all, ntohs(t->src.u.all),
 129                t->dst.u3.all, ntohs(t->dst.u.all));
 130 #endif
 131 }
 132
 133 static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
 134 {
 135         switch (t->src.l3num) {
 136         case AF_INET:
 137                 nf_ct_dump_tuple_ip(t);
 138                 break;
 139         case AF_INET6:
 140                 nf_ct_dump_tuple_ipv6(t);
 141                 break;
 142         }
 143 }
 144
 145 /* If we're the first tuple, it's the original dir. */
 146 #define NF_CT_DIRECTION(h)                                              \
 147         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 148
 149 /* Connections have two entries in the hash table: one for each way */
 150 struct nf_conntrack_tuple_hash {
 151         struct hlist_nulls_node hnnode;
 152         struct nf_conntrack_tuple tuple;
 153 };
 154
 155 #endif /* __KERNEL__ */
 156
 157 static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
 158                                            const struct nf_conntrack_tuple *t2)
 159 {
 160         return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
 161                 t1->src.u.all == t2->src.u.all &&
 162                 t1->src.l3num == t2->src.l3num);
 163 }
 164
 165 static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
 166                                            const struct nf_conntrack_tuple *t2)
 167 {
 168         return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
 169                 t1->dst.u.all == t2->dst.u.all &&
 170                 t1->dst.protonum == t2->dst.protonum);
 171 }
 172
 173 static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
 174                                      const struct nf_conntrack_tuple *t2)
 175 {
 176         return __nf_ct_tuple_src_equal(t1, t2) &&
 177                __nf_ct_tuple_dst_equal(t1, t2);
 178 }
 179
 180 static inline bool
 181 nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
 182                        const struct nf_conntrack_tuple_mask *m2)
 183 {
 184         return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
 185                 m1->src.u.all == m2->src.u.all);
 186 }
 187
 188 static inline bool
 189 nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
 190                          const struct nf_conntrack_tuple *t2,
 191                          const struct nf_conntrack_tuple_mask *mask)
 192 {
 193         int count;
 194
 195         for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
 196                 if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
 197                     mask->src.u3.all[count])
 198                         return false;
 199         }
 200
 201         if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
 202                 return false;
 203
 204         if (t1->src.l3num != t2->src.l3num ||
 205             t1->dst.protonum != t2->dst.protonum)
 206                 return false;
 207
 208         return true;
 209 }
 210
 211 static inline bool
 212 nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
 213                      const struct nf_conntrack_tuple *tuple,
 214                      const struct nf_conntrack_tuple_mask *mask)
 215 {
 216         return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
 217                __nf_ct_tuple_dst_equal(t, tuple);
 218 }
 219
 220 #endif /* _NF_CONNTRACK_TUPLE_H */