1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Definitions and Declarations for tuple. 4 * 5 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> 6 * - generalize L3 protocol dependent part. 7 * 8 * Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h 9 */ 10 11 #ifndef _NF_CONNTRACK_TUPLE_H 12 #define _NF_CONNTRACK_TUPLE_H 13 14 #include <linux/netfilter/x_tables.h> 15 #include <linux/netfilter/nf_conntrack_tuple_common.h> 16 #include <linux/list_nulls.h> 17 18 /* A `tuple' is a structure containing the information to uniquely 19 identify a connection. ie. if two packets have the same tuple, they 20 are in the same connection; if not, they are not. 21 22 We divide the structure along "manipulatable" and 23 "non-manipulatable" lines, for the benefit of the NAT code. 24 */ 25 26 #define NF_CT_TUPLE_L3SIZE ARRAY_SIZE(((union nf_inet_addr *)NULL)->all) 27 28 /* The manipulable part of the tuple. */ 29 struct nf_conntrack_man { 30 union nf_inet_addr u3; 31 union nf_conntrack_man_proto u; 32 /* Layer 3 protocol */ 33 u_int16_t l3num; 34 }; 35 36 /* This contains the information to distinguish a connection. */ 37 struct nf_conntrack_tuple { 38 struct nf_conntrack_man src; 39 40 /* These are the parts of the tuple which are fixed. */ 41 struct { 42 union nf_inet_addr u3; 43 union { 44 /* Add other protocols here. */ 45 __be16 all; 46 47 struct { 48 __be16 port; 49 } tcp; 50 struct { 51 __be16 port; 52 } udp; 53 struct { 54 u_int8_t type, code; 55 } icmp; 56 struct { 57 __be16 port; 58 } dccp; 59 struct { 60 __be16 port; 61 } sctp; 62 struct { 63 __be16 key; 64 } gre; 65 } u; 66 67 /* The protocol. */ 68 u_int8_t protonum; 69 70 /* The direction (for tuplehash) */ 71 u_int8_t dir; 72 } dst; 73 }; 74 75 struct nf_conntrack_tuple_mask { 76 struct { 77 union nf_inet_addr u3; 78 union nf_conntrack_man_proto u; 79 } src; 80 }; 81 82 static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t) 83 { 84 #ifdef DEBUG 85 printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n", 86 t, t->dst.protonum, 87 &t->src.u3.ip, ntohs(t->src.u.all), 88 &t->dst.u3.ip, ntohs(t->dst.u.all)); 89 #endif 90 } 91 92 static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t) 93 { 94 #ifdef DEBUG 95 printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n", 96 t, t->dst.protonum, 97 t->src.u3.all, ntohs(t->src.u.all), 98 t->dst.u3.all, ntohs(t->dst.u.all)); 99 #endif 100 } 101 102 static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t) 103 { 104 switch (t->src.l3num) { 105 case AF_INET: 106 nf_ct_dump_tuple_ip(t); 107 break; 108 case AF_INET6: 109 nf_ct_dump_tuple_ipv6(t); 110 break; 111 } 112 } 113 114 /* If we're the first tuple, it's the original dir. */ 115 #define NF_CT_DIRECTION(h) \ 116 ((enum ip_conntrack_dir)(h)->tuple.dst.dir) 117 118 /* Connections have two entries in the hash table: one for each way */ 119 struct nf_conntrack_tuple_hash { 120 struct hlist_nulls_node hnnode; 121 struct nf_conntrack_tuple tuple; 122 }; 123 124 static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1, 125 const struct nf_conntrack_tuple *t2) 126 { 127 return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) && 128 t1->src.u.all == t2->src.u.all && 129 t1->src.l3num == t2->src.l3num); 130 } 131 132 static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1, 133 const struct nf_conntrack_tuple *t2) 134 { 135 return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) && 136 t1->dst.u.all == t2->dst.u.all && 137 t1->dst.protonum == t2->dst.protonum); 138 } 139 140 static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1, 141 const struct nf_conntrack_tuple *t2) 142 { 143 return __nf_ct_tuple_src_equal(t1, t2) && 144 __nf_ct_tuple_dst_equal(t1, t2); 145 } 146 147 static inline bool 148 nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1, 149 const struct nf_conntrack_tuple_mask *m2) 150 { 151 return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) && 152 m1->src.u.all == m2->src.u.all); 153 } 154 155 static inline bool 156 nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1, 157 const struct nf_conntrack_tuple *t2, 158 const struct nf_conntrack_tuple_mask *mask) 159 { 160 int count; 161 162 for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) { 163 if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) & 164 mask->src.u3.all[count]) 165 return false; 166 } 167 168 if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all) 169 return false; 170 171 if (t1->src.l3num != t2->src.l3num || 172 t1->dst.protonum != t2->dst.protonum) 173 return false; 174 175 return true; 176 } 177 178 static inline bool 179 nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t, 180 const struct nf_conntrack_tuple *tuple, 181 const struct nf_conntrack_tuple_mask *mask) 182 { 183 return nf_ct_tuple_src_mask_cmp(t, tuple, mask) && 184 __nf_ct_tuple_dst_equal(t, tuple); 185 } 186 187 #endif /* _NF_CONNTRACK_TUPLE_H */ 188