flow.h revision 806566cc78390b1565ded91712cd28619cea5f57 
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
27struct flowi {
28	struct flowi_common	__fl_common;
29#define flowi_oif		__fl_common.flowic_oif
30#define flowi_iif		__fl_common.flowic_iif
31#define flowi_mark		__fl_common.flowic_mark
32#define flowi_tos		__fl_common.flowic_tos
33#define flowi_scope		__fl_common.flowic_scope
34#define flowi_proto		__fl_common.flowic_proto
35#define flowi_flags		__fl_common.flowic_flags
36#define flowi_secid		__fl_common.flowic_secid
37
38	union {
39		struct {
40			__be32			daddr;
41			__be32			saddr;
42		} ip4_u;
43
44		struct {
45			struct in6_addr		daddr;
46			struct in6_addr		saddr;
47			__be32			flowlabel;
48		} ip6_u;
49
50		struct {
51			__le16			daddr;
52			__le16			saddr;
53			__u8			scope;
54		} dn_u;
55	} nl_u;
56#define fld_dst		nl_u.dn_u.daddr
57#define fld_src		nl_u.dn_u.saddr
58#define fld_scope	nl_u.dn_u.scope
59#define fl6_dst		nl_u.ip6_u.daddr
60#define fl6_src		nl_u.ip6_u.saddr
61#define fl6_flowlabel	nl_u.ip6_u.flowlabel
62#define fl4_dst		nl_u.ip4_u.daddr
63#define fl4_src		nl_u.ip4_u.saddr
64#define fl4_tos		flowi_tos
65#define fl4_scope	flowi_scope
66
67	union {
68		struct {
69			__be16	sport;
70			__be16	dport;
71		} ports;
72
73		struct {
74			__u8	type;
75			__u8	code;
76		} icmpt;
77
78		struct {
79			__le16	sport;
80			__le16	dport;
81		} dnports;
82
83		__be32		spi;
84		__be32		gre_key;
85
86		struct {
87			__u8	type;
88		} mht;
89	} uli_u;
90#define fl_ip_sport	uli_u.ports.sport
91#define fl_ip_dport	uli_u.ports.dport
92#define fl_icmp_type	uli_u.icmpt.type
93#define fl_icmp_code	uli_u.icmpt.code
94#define fl_ipsec_spi	uli_u.spi
95#define fl_mh_type	uli_u.mht.type
96#define fl_gre_key	uli_u.gre_key
97} __attribute__((__aligned__(BITS_PER_LONG/8)));
98
99#define FLOW_DIR_IN	0
100#define FLOW_DIR_OUT	1
101#define FLOW_DIR_FWD	2
102
103struct net;
104struct sock;
105struct flow_cache_ops;
106
107struct flow_cache_object {
108	const struct flow_cache_ops *ops;
109};
110
111struct flow_cache_ops {
112	struct flow_cache_object *(*get)(struct flow_cache_object *);
113	int (*check)(struct flow_cache_object *);
114	void (*delete)(struct flow_cache_object *);
115};
116
117typedef struct flow_cache_object *(*flow_resolve_t)(
118		struct net *net, const struct flowi *key, u16 family,
119		u8 dir, struct flow_cache_object *oldobj, void *ctx);
120
121extern struct flow_cache_object *flow_cache_lookup(
122		struct net *net, const struct flowi *key, u16 family,
123		u8 dir, flow_resolve_t resolver, void *ctx);
124
125extern void flow_cache_flush(void);
126extern atomic_t flow_cache_genid;
127
128static inline int flow_cache_uli_match(const struct flowi *fl1,
129				       const struct flowi *fl2)
130{
131	return (fl1->flowi_proto == fl2->flowi_proto &&
132		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
133}
134
135#endif
136