flow.h revision 9cce96df5b76691712dba22e83ff5efe900361e1 
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};
88
89struct flowidn {
90	struct flowi_common	__fl_common;
91	__le16			daddr;
92	__le16			saddr;
93	union flowi_uli		uli;
94};
95
96struct flowi {
97	union {
98		struct flowi_common	__fl_common;
99		struct flowi4		ip4;
100		struct flowi6		ip6;
101		struct flowidn		dn;
102	} u;
103#define flowi_oif	u.__fl_common.flowic_oif
104#define flowi_iif	u.__fl_common.flowic_iif
105#define flowi_mark	u.__fl_common.flowic_mark
106#define flowi_tos	u.__fl_common.flowic_tos
107#define flowi_scope	u.__fl_common.flowic_scope
108#define flowi_proto	u.__fl_common.flowic_proto
109#define flowi_flags	u.__fl_common.flowic_flags
110#define flowi_secid	u.__fl_common.flowic_secid
111#define fld_scope	flowi_scope
112
113#define fld_dst		u.dn.daddr
114#define fld_src		u.dn.saddr
115#define fl6_dst		u.ip6.daddr
116#define fl6_src		u.ip6.saddr
117#define fl6_flowlabel	u.ip6.flowlabel
118#define fl6_sport	u.ip6.uli.ports.sport
119#define fl6_dport	u.ip6.uli.ports.dport
120#define fl6_icmp_type	u.ip6.uli.icmpt.type
121#define fl6_icmp_code	u.ip6.uli.icmpt.code
122#define fl6_ipsec_spi	u.ip6.uli.spi
123#define fl6_mh_type	u.ip6.uli.mht.type
124#define fl6_gre_key	u.ip6.uli.gre_key
125} __attribute__((__aligned__(BITS_PER_LONG/8)));
126
127static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
128{
129	return container_of(fl4, struct flowi, u.ip4);
130}
131
132static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
133{
134	return container_of(fl6, struct flowi, u.ip6);
135}
136
137static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
138{
139	return container_of(fldn, struct flowi, u.dn);
140}
141
142#define FLOW_DIR_IN	0
143#define FLOW_DIR_OUT	1
144#define FLOW_DIR_FWD	2
145
146struct net;
147struct sock;
148struct flow_cache_ops;
149
150struct flow_cache_object {
151	const struct flow_cache_ops *ops;
152};
153
154struct flow_cache_ops {
155	struct flow_cache_object *(*get)(struct flow_cache_object *);
156	int (*check)(struct flow_cache_object *);
157	void (*delete)(struct flow_cache_object *);
158};
159
160typedef struct flow_cache_object *(*flow_resolve_t)(
161		struct net *net, const struct flowi *key, u16 family,
162		u8 dir, struct flow_cache_object *oldobj, void *ctx);
163
164extern struct flow_cache_object *flow_cache_lookup(
165		struct net *net, const struct flowi *key, u16 family,
166		u8 dir, flow_resolve_t resolver, void *ctx);
167
168extern void flow_cache_flush(void);
169extern atomic_t flow_cache_genid;
170
171#endif
172