flow.h revision bef55aebd560c5a6f8883c421abccee39978c58c 
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
13struct 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
27union 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
51struct 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
73struct 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
96struct 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
111struct 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
128static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
129{
130	return container_of(fl4, struct flowi, u.ip4);
131}
132
133static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
134{
135	return container_of(fl6, struct flowi, u.ip6);
136}
137
138static 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
147struct net;
148struct sock;
149struct flow_cache_ops;
150
151struct flow_cache_object {
152	const struct flow_cache_ops *ops;
153};
154
155struct 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
161typedef 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
165extern 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
169extern void flow_cache_flush(void);
170extern atomic_t flow_cache_genid;
171
172#endif
173