1 /*
2 *
3 * Generic internet FLOW.
4 *
5 */
6
7 #ifndef _NET_FLOW_H
8 #define _NET_FLOW_H
9
10 #include <linux/in6.h>
11 #include <asm/atomic.h>
12
13 struct flowi_common {
14 int flowic_oif;
15 int flowic_iif;
16 __u32 flowic_mark;
17 __u8 flowic_tos;
18 __u8 flowic_scope;
19 __u8 flowic_proto;
20 __u8 flowic_flags;
21 #define FLOWI_FLAG_ANYSRC 0x01
22 #define FLOWI_FLAG_PRECOW_METRICS 0x02
23 #define FLOWI_FLAG_CAN_SLEEP 0x04
24 __u32 flowic_secid;
25 };
26
27 union flowi_uli {
28 struct {
29 __be16 sport;
30 __be16 dport;
31 } ports;
32
33 struct {
34 __u8 type;
35 __u8 code;
36 } icmpt;
37
38 struct {
39 __le16 sport;
40 __le16 dport;
41 } dnports;
42
43 __be32 spi;
44 __be32 gre_key;
45
46 struct {
47 __u8 type;
48 } mht;
49 };
50
51 struct flowi4 {
52 struct flowi_common __fl_common;
53 #define flowi4_oif __fl_common.flowic_oif
54 #define flowi4_iif __fl_common.flowic_iif
55 #define flowi4_mark __fl_common.flowic_mark
56 #define flowi4_tos __fl_common.flowic_tos
57 #define flowi4_scope __fl_common.flowic_scope
58 #define flowi4_proto __fl_common.flowic_proto
59 #define flowi4_flags __fl_common.flowic_flags
60 #define flowi4_secid __fl_common.flowic_secid
61 __be32 daddr;
62 __be32 saddr;
63 union flowi_uli uli;
64 #define fl4_sport uli.ports.sport
65 #define fl4_dport uli.ports.dport
66 #define fl4_icmp_type uli.icmpt.type
67 #define fl4_icmp_code uli.icmpt.code
68 #define fl4_ipsec_spi uli.spi
69 #define fl4_mh_type uli.mht.type
70 #define fl4_gre_key uli.gre_key
71 };
72
73 struct flowi6 {
74 struct flowi_common __fl_common;
75 #define flowi6_oif __fl_common.flowic_oif
76 #define flowi6_iif __fl_common.flowic_iif
77 #define flowi6_mark __fl_common.flowic_mark
78 #define flowi6_tos __fl_common.flowic_tos
79 #define flowi6_scope __fl_common.flowic_scope
80 #define flowi6_proto __fl_common.flowic_proto
81 #define flowi6_flags __fl_common.flowic_flags
82 #define flowi6_secid __fl_common.flowic_secid
83 struct in6_addr daddr;
84 struct in6_addr saddr;
85 __be32 flowlabel;
86 union flowi_uli uli;
87 #define fl6_sport uli.ports.sport
88 #define fl6_dport uli.ports.dport
89 #define fl6_icmp_type uli.icmpt.type
90 #define fl6_icmp_code uli.icmpt.code
91 #define fl6_ipsec_spi uli.spi
92 #define fl6_mh_type uli.mht.type
93 #define fl6_gre_key uli.gre_key
94 };
95
96 struct flowidn {
97 struct flowi_common __fl_common;
98 #define flowidn_oif __fl_common.flowic_oif
99 #define flowidn_iif __fl_common.flowic_iif
100 #define flowidn_mark __fl_common.flowic_mark
101 #define flowidn_scope __fl_common.flowic_scope
102 #define flowidn_proto __fl_common.flowic_proto
103 #define flowidn_flags __fl_common.flowic_flags
104 __le16 daddr;
105 __le16 saddr;
106 union flowi_uli uli;
107 #define fld_sport uli.ports.sport
108 #define fld_dport uli.ports.dport
109 };
110
111 struct flowi {
112 union {
113 struct flowi_common __fl_common;
114 struct flowi4 ip4;
115 struct flowi6 ip6;
116 struct flowidn dn;
117 } u;
118 #define flowi_oif u.__fl_common.flowic_oif
119 #define flowi_iif u.__fl_common.flowic_iif
120 #define flowi_mark u.__fl_common.flowic_mark
121 #define flowi_tos u.__fl_common.flowic_tos
122 #define flowi_scope u.__fl_common.flowic_scope
123 #define flowi_proto u.__fl_common.flowic_proto
124 #define flowi_flags u.__fl_common.flowic_flags
125 #define flowi_secid u.__fl_common.flowic_secid
126 } __attribute__((__aligned__(BITS_PER_LONG/8)));
127
flowi4_to_flowi(struct flowi4 * fl4)128 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
129 {
130 return container_of(fl4, struct flowi, u.ip4);
131 }
132
flowi6_to_flowi(struct flowi6 * fl6)133 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
134 {
135 return container_of(fl6, struct flowi, u.ip6);
136 }
137
flowidn_to_flowi(struct flowidn * fldn)138 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
139 {
140 return container_of(fldn, struct flowi, u.dn);
141 }
142
143 #define FLOW_DIR_IN 0
144 #define FLOW_DIR_OUT 1
145 #define FLOW_DIR_FWD 2
146
147 struct net;
148 struct sock;
149 struct flow_cache_ops;
150
151 struct flow_cache_object {
152 const struct flow_cache_ops *ops;
153 };
154
155 struct flow_cache_ops {
156 struct flow_cache_object *(*get)(struct flow_cache_object *);
157 int (*check)(struct flow_cache_object *);
158 void (*delete)(struct flow_cache_object *);
159 };
160
161 typedef struct flow_cache_object *(*flow_resolve_t)(
162 struct net *net, const struct flowi *key, u16 family,
163 u8 dir, struct flow_cache_object *oldobj, void *ctx);
164
165 extern struct flow_cache_object *flow_cache_lookup(
166 struct net *net, const struct flowi *key, u16 family,
167 u8 dir, flow_resolve_t resolver, void *ctx);
168
169 extern void flow_cache_flush(void);
170 extern atomic_t flow_cache_genid;
171
172 #endif
173