flow.h revision fbef0a40919a80eb8a02fe9d3b96dfdcdebf4317 
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 {
14	int	oif;
15	int	iif;
16	__u32	mark;
17	__u8	tos;
18	__u8	scope;
19	__u8	proto;
20	__u8	flags;
21#define FLOWI_FLAG_ANYSRC		0x01
22#define FLOWI_FLAG_PRECOW_METRICS	0x02
23#define FLOWI_FLAG_CAN_SLEEP		0x04
24	__u32	secid;
25
26	union {
27		struct {
28			__be32			daddr;
29			__be32			saddr;
30		} ip4_u;
31
32		struct {
33			struct in6_addr		daddr;
34			struct in6_addr		saddr;
35			__be32			flowlabel;
36		} ip6_u;
37
38		struct {
39			__le16			daddr;
40			__le16			saddr;
41			__u8			scope;
42		} dn_u;
43	} nl_u;
44#define fld_dst		nl_u.dn_u.daddr
45#define fld_src		nl_u.dn_u.saddr
46#define fld_scope	nl_u.dn_u.scope
47#define fl6_dst		nl_u.ip6_u.daddr
48#define fl6_src		nl_u.ip6_u.saddr
49#define fl6_flowlabel	nl_u.ip6_u.flowlabel
50#define fl4_dst		nl_u.ip4_u.daddr
51#define fl4_src		nl_u.ip4_u.saddr
52#define fl4_tos		tos
53#define fl4_scope	scope
54
55	union {
56		struct {
57			__be16	sport;
58			__be16	dport;
59		} ports;
60
61		struct {
62			__u8	type;
63			__u8	code;
64		} icmpt;
65
66		struct {
67			__le16	sport;
68			__le16	dport;
69		} dnports;
70
71		__be32		spi;
72		__be32		gre_key;
73
74		struct {
75			__u8	type;
76		} mht;
77	} uli_u;
78#define fl_ip_sport	uli_u.ports.sport
79#define fl_ip_dport	uli_u.ports.dport
80#define fl_icmp_type	uli_u.icmpt.type
81#define fl_icmp_code	uli_u.icmpt.code
82#define fl_ipsec_spi	uli_u.spi
83#define fl_mh_type	uli_u.mht.type
84#define fl_gre_key	uli_u.gre_key
85} __attribute__((__aligned__(BITS_PER_LONG/8)));
86
87#define FLOW_DIR_IN	0
88#define FLOW_DIR_OUT	1
89#define FLOW_DIR_FWD	2
90
91struct net;
92struct sock;
93struct flow_cache_ops;
94
95struct flow_cache_object {
96	const struct flow_cache_ops *ops;
97};
98
99struct flow_cache_ops {
100	struct flow_cache_object *(*get)(struct flow_cache_object *);
101	int (*check)(struct flow_cache_object *);
102	void (*delete)(struct flow_cache_object *);
103};
104
105typedef struct flow_cache_object *(*flow_resolve_t)(
106		struct net *net, const struct flowi *key, u16 family,
107		u8 dir, struct flow_cache_object *oldobj, void *ctx);
108
109extern struct flow_cache_object *flow_cache_lookup(
110		struct net *net, const struct flowi *key, u16 family,
111		u8 dir, flow_resolve_t resolver, void *ctx);
112
113extern void flow_cache_flush(void);
114extern atomic_t flow_cache_genid;
115
116static inline int flow_cache_uli_match(const struct flowi *fl1,
117				       const struct flowi *fl2)
118{
119	return (fl1->proto == fl2->proto &&
120		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
121}
122
123#endif
124