flow.h revision 59b1a94c9a034e63a5e030a5154be1d4d84677d9 
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	__be32			daddr;
54	__be32			saddr;
55	union flowi_uli		uli;
56};
57
58struct flowi6 {
59	struct flowi_common	__fl_common;
60	struct in6_addr		daddr;
61	struct in6_addr		saddr;
62	__be32			flowlabel;
63	union flowi_uli		uli;
64};
65
66struct flowidn {
67	struct flowi_common	__fl_common;
68	__le16			daddr;
69	__le16			saddr;
70	union flowi_uli		uli;
71};
72
73struct flowi {
74	union {
75		struct flowi_common	__fl_common;
76		struct flowi4		ip4;
77		struct flowi6		ip6;
78		struct flowidn		dn;
79	} u;
80#define flowi_oif	u.__fl_common.flowic_oif
81#define flowi_iif	u.__fl_common.flowic_iif
82#define flowi_mark	u.__fl_common.flowic_mark
83#define flowi_tos	u.__fl_common.flowic_tos
84#define flowi_scope	u.__fl_common.flowic_scope
85#define flowi_proto	u.__fl_common.flowic_proto
86#define flowi_flags	u.__fl_common.flowic_flags
87#define flowi_secid	u.__fl_common.flowic_secid
88#define fl4_tos		flowi_tos
89#define fl4_scope	flowi_scope
90#define fld_scope	flowi_scope
91
92#define fld_dst		u.dn.daddr
93#define fld_src		u.dn.saddr
94#define fl6_dst		u.ip6.daddr
95#define fl6_src		u.ip6.saddr
96#define fl6_flowlabel	u.ip6.flowlabel
97#define fl4_dst		u.ip4.daddr
98#define fl4_src		u.ip4.saddr
99#define fl4_sport	u.ip4.uli.ports.sport
100#define fl4_dport	u.ip4.uli.ports.dport
101#define fl4_icmp_type	u.ip4.uli.icmpt.type
102#define fl4_icmp_code	u.ip4.uli.icmpt.code
103#define fl4_ipsec_spi	u.ip4.uli.spi
104#define fl4_mh_type	u.ip4.uli.mht.type
105#define fl4_gre_key	u.ip4.uli.gre_key
106#define fl6_sport	u.ip6.uli.ports.sport
107#define fl6_dport	u.ip6.uli.ports.dport
108#define fl6_icmp_type	u.ip6.uli.icmpt.type
109#define fl6_icmp_code	u.ip6.uli.icmpt.code
110#define fl6_ipsec_spi	u.ip6.uli.spi
111#define fl6_mh_type	u.ip6.uli.mht.type
112#define fl6_gre_key	u.ip6.uli.gre_key
113} __attribute__((__aligned__(BITS_PER_LONG/8)));
114
115static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
116{
117	return container_of(fl4, struct flowi, u.ip4);
118}
119
120static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
121{
122	return container_of(fl6, struct flowi, u.ip6);
123}
124
125static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
126{
127	return container_of(fldn, struct flowi, u.dn);
128}
129
130#define FLOW_DIR_IN	0
131#define FLOW_DIR_OUT	1
132#define FLOW_DIR_FWD	2
133
134struct net;
135struct sock;
136struct flow_cache_ops;
137
138struct flow_cache_object {
139	const struct flow_cache_ops *ops;
140};
141
142struct flow_cache_ops {
143	struct flow_cache_object *(*get)(struct flow_cache_object *);
144	int (*check)(struct flow_cache_object *);
145	void (*delete)(struct flow_cache_object *);
146};
147
148typedef struct flow_cache_object *(*flow_resolve_t)(
149		struct net *net, const struct flowi *key, u16 family,
150		u8 dir, struct flow_cache_object *oldobj, void *ctx);
151
152extern struct flow_cache_object *flow_cache_lookup(
153		struct net *net, const struct flowi *key, u16 family,
154		u8 dir, flow_resolve_t resolver, void *ctx);
155
156extern void flow_cache_flush(void);
157extern atomic_t flow_cache_genid;
158
159#endif
160