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         } 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 {
  56         union nf_inet_addr u3;
  57         union nf_conntrack_man_proto u;
  58         /* Layer 3 protocol */
  59         u_int16_t l3num;
  60 };
  61
  62 /* This contains the information to distinguish a connection. */
  63 struct nf_conntrack_tuple
  64 {
  65         struct nf_conntrack_man src;
  66
  67         /* These are the parts of the tuple which are fixed. */
  68         struct {
  69                 union nf_inet_addr u3;
  70                 union {
  71                         /* Add other protocols here. */
  72                         __be16 all;
  73
  74                         struct {
  75                                 __be16 port;
  76                         } tcp;
  77                         struct {
  78                                 __be16 port;
  79                         } udp;
  80                         struct {
  81                                 u_int8_t type, code;
  82                         } icmp;
  83                         struct {
  84                                 __be16 port;
  85                         } dccp;
  86                         struct {
  87                                 __be16 port;
  88                         } sctp;
  89                         struct {
  90                                 __be16 key;
  91                         } gre;
  92                 } u;
  93
  94                 /* The protocol. */
  95                 u_int8_t protonum;
  96
  97                 /* The direction (for tuplehash) */
  98                 u_int8_t dir;
  99         } dst;
 100 };
 101
 102 struct nf_conntrack_tuple_mask
 103 {
 104         struct {
 105                 union nf_inet_addr u3;
 106                 union nf_conntrack_man_proto u;
 107         } src;
 108 };
 109
 110 #ifdef __KERNEL__
 111
 112 static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
 113 {
 114 #ifdef DEBUG
 115         printk("tuple %p: %u " NIPQUAD_FMT ":%hu -> " NIPQUAD_FMT ":%hu\n",
 116                t, t->dst.protonum,
 117                NIPQUAD(t->src.u3.ip), ntohs(t->src.u.all),
 118                NIPQUAD(t->dst.u3.ip), ntohs(t->dst.u.all));
 119 #endif
 120 }
 121
 122 static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
 123 {
 124 #ifdef DEBUG
 125         printk("tuple %p: %u %p6 %hu -> %p6 %hu\n",
 126                t, t->dst.protonum,
 127                t->src.u3.all, ntohs(t->src.u.all),
 128                t->dst.u3.all, ntohs(t->dst.u.all));
 129 #endif
 130 }
 131
 132 static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
 133 {
 134         switch (t->src.l3num) {
 135         case AF_INET:
 136                 nf_ct_dump_tuple_ip(t);
 137                 break;
 138         case AF_INET6:
 139                 nf_ct_dump_tuple_ipv6(t);
 140                 break;
 141         }
 142 }
 143
 144 /* If we're the first tuple, it's the original dir. */
 145 #define NF_CT_DIRECTION(h)                                              \
 146         ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
 147
 148 /* Connections have two entries in the hash table: one for each way */
 149 struct nf_conntrack_tuple_hash
 150 {
 151         struct hlist_node hnode;
 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 */