flow.h revision 08704bcbf022786532b5f188935ab6619906049f 
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 flowi {
52	struct flowi_common	__fl_common;
53#define flowi_oif		__fl_common.flowic_oif
54#define flowi_iif		__fl_common.flowic_iif
55#define flowi_mark		__fl_common.flowic_mark
56#define flowi_tos		__fl_common.flowic_tos
57#define flowi_scope		__fl_common.flowic_scope
58#define flowi_proto		__fl_common.flowic_proto
59#define flowi_flags		__fl_common.flowic_flags
60#define flowi_secid		__fl_common.flowic_secid
61
62	union {
63		struct {
64			__be32			daddr;
65			__be32			saddr;
66		} ip4_u;
67
68		struct {
69			struct in6_addr		daddr;
70			struct in6_addr		saddr;
71			__be32			flowlabel;
72		} ip6_u;
73
74		struct {
75			__le16			daddr;
76			__le16			saddr;
77			__u8			scope;
78		} dn_u;
79	} nl_u;
80#define fld_dst		nl_u.dn_u.daddr
81#define fld_src		nl_u.dn_u.saddr
82#define fld_scope	nl_u.dn_u.scope
83#define fl6_dst		nl_u.ip6_u.daddr
84#define fl6_src		nl_u.ip6_u.saddr
85#define fl6_flowlabel	nl_u.ip6_u.flowlabel
86#define fl4_dst		nl_u.ip4_u.daddr
87#define fl4_src		nl_u.ip4_u.saddr
88#define fl4_tos		flowi_tos
89#define fl4_scope	flowi_scope
90
91	union flowi_uli uli_u;
92#define fl_ip_sport	uli_u.ports.sport
93#define fl_ip_dport	uli_u.ports.dport
94#define fl_icmp_type	uli_u.icmpt.type
95#define fl_icmp_code	uli_u.icmpt.code
96#define fl_ipsec_spi	uli_u.spi
97#define fl_mh_type	uli_u.mht.type
98#define fl_gre_key	uli_u.gre_key
99} __attribute__((__aligned__(BITS_PER_LONG/8)));
100
101#define FLOW_DIR_IN	0
102#define FLOW_DIR_OUT	1
103#define FLOW_DIR_FWD	2
104
105struct net;
106struct sock;
107struct flow_cache_ops;
108
109struct flow_cache_object {
110	const struct flow_cache_ops *ops;
111};
112
113struct flow_cache_ops {
114	struct flow_cache_object *(*get)(struct flow_cache_object *);
115	int (*check)(struct flow_cache_object *);
116	void (*delete)(struct flow_cache_object *);
117};
118
119typedef struct flow_cache_object *(*flow_resolve_t)(
120		struct net *net, const struct flowi *key, u16 family,
121		u8 dir, struct flow_cache_object *oldobj, void *ctx);
122
123extern struct flow_cache_object *flow_cache_lookup(
124		struct net *net, const struct flowi *key, u16 family,
125		u8 dir, flow_resolve_t resolver, void *ctx);
126
127extern void flow_cache_flush(void);
128extern atomic_t flow_cache_genid;
129
130static inline int flow_cache_uli_match(const struct flowi *fl1,
131				       const struct flowi *fl2)
132{
133	return (fl1->flowi_proto == fl2->flowi_proto &&
134		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
135}
136
137#endif
138