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 */ 187