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 must be ignored for the tuplehash */
71 struct { } __nfct_hash_offsetend;
72
73 /* The direction (for tuplehash) */
74 u_int8_t dir;
75 } dst;
76 };
77
78 struct nf_conntrack_tuple_mask {
79 struct {
80 union nf_inet_addr u3;
81 union nf_conntrack_man_proto u;
82 } src;
83 };
84
nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple * t)85 static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
86 {
87 #ifdef DEBUG
88 printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
89 t, t->dst.protonum,
90 &t->src.u3.ip, ntohs(t->src.u.all),
91 &t->dst.u3.ip, ntohs(t->dst.u.all));
92 #endif
93 }
94
nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple * t)95 static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
96 {
97 #ifdef DEBUG
98 printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
99 t, t->dst.protonum,
100 t->src.u3.all, ntohs(t->src.u.all),
101 t->dst.u3.all, ntohs(t->dst.u.all));
102 #endif
103 }
104
nf_ct_dump_tuple(const struct nf_conntrack_tuple * t)105 static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
106 {
107 switch (t->src.l3num) {
108 case AF_INET:
109 nf_ct_dump_tuple_ip(t);
110 break;
111 case AF_INET6:
112 nf_ct_dump_tuple_ipv6(t);
113 break;
114 }
115 }
116
117 /* If we're the first tuple, it's the original dir. */
118 #define NF_CT_DIRECTION(h) \
119 ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
120
121 /* Connections have two entries in the hash table: one for each way */
122 struct nf_conntrack_tuple_hash {
123 struct hlist_nulls_node hnnode;
124 struct nf_conntrack_tuple tuple;
125 };
126
__nf_ct_tuple_src_equal(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2)127 static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
128 const struct nf_conntrack_tuple *t2)
129 {
130 return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
131 t1->src.u.all == t2->src.u.all &&
132 t1->src.l3num == t2->src.l3num);
133 }
134
__nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2)135 static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
136 const struct nf_conntrack_tuple *t2)
137 {
138 return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
139 t1->dst.u.all == t2->dst.u.all &&
140 t1->dst.protonum == t2->dst.protonum);
141 }
142
nf_ct_tuple_equal(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2)143 static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
144 const struct nf_conntrack_tuple *t2)
145 {
146 return __nf_ct_tuple_src_equal(t1, t2) &&
147 __nf_ct_tuple_dst_equal(t1, t2);
148 }
149
150 static inline bool
nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask * m1,const struct nf_conntrack_tuple_mask * m2)151 nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
152 const struct nf_conntrack_tuple_mask *m2)
153 {
154 return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
155 m1->src.u.all == m2->src.u.all);
156 }
157
158 static inline bool
nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2,const struct nf_conntrack_tuple_mask * mask)159 nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
160 const struct nf_conntrack_tuple *t2,
161 const struct nf_conntrack_tuple_mask *mask)
162 {
163 int count;
164
165 for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
166 if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
167 mask->src.u3.all[count])
168 return false;
169 }
170
171 if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
172 return false;
173
174 if (t1->src.l3num != t2->src.l3num ||
175 t1->dst.protonum != t2->dst.protonum)
176 return false;
177
178 return true;
179 }
180
181 static inline bool
nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple * t,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple_mask * mask)182 nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
183 const struct nf_conntrack_tuple *tuple,
184 const struct nf_conntrack_tuple_mask *mask)
185 {
186 return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
187 __nf_ct_tuple_dst_equal(t, tuple);
188 }
189
190 #endif /* _NF_CONNTRACK_TUPLE_H */
191