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
nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple * t)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
nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple * t)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
nf_ct_dump_tuple(const struct nf_conntrack_tuple * t)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
__nf_ct_tuple_src_equal(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2)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
__nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2)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
nf_ct_tuple_equal(const struct nf_conntrack_tuple * t1,const struct nf_conntrack_tuple * t2)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
nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask * m1,const struct nf_conntrack_tuple_mask * m2)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
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)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
nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple * t,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple_mask * mask)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