flow.h revision 4465b469008bc03b98a1b8df4e9ae501b6c69d4b 
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
18	union {
19		struct {
20			__be32			daddr;
21			__be32			saddr;
22			__u8			tos;
23			__u8			scope;
24		} ip4_u;
25
26		struct {
27			struct in6_addr		daddr;
28			struct in6_addr		saddr;
29			__be32			flowlabel;
30		} ip6_u;
31
32		struct {
33			__le16			daddr;
34			__le16			saddr;
35			__u8			scope;
36		} dn_u;
37	} nl_u;
38#define fld_dst		nl_u.dn_u.daddr
39#define fld_src		nl_u.dn_u.saddr
40#define fld_scope	nl_u.dn_u.scope
41#define fl6_dst		nl_u.ip6_u.daddr
42#define fl6_src		nl_u.ip6_u.saddr
43#define fl6_flowlabel	nl_u.ip6_u.flowlabel
44#define fl4_dst		nl_u.ip4_u.daddr
45#define fl4_src		nl_u.ip4_u.saddr
46#define fl4_tos		nl_u.ip4_u.tos
47#define fl4_scope	nl_u.ip4_u.scope
48
49	__u8	proto;
50	__u8	flags;
51#define FLOWI_FLAG_ANYSRC 0x01
52#define FLOWI_FLAG_MATCH_ANY_IIF 0x02
53	union {
54		struct {
55			__be16	sport;
56			__be16	dport;
57		} ports;
58
59		struct {
60			__u8	type;
61			__u8	code;
62		} icmpt;
63
64		struct {
65			__le16	sport;
66			__le16	dport;
67		} dnports;
68
69		__be32		spi;
70
71		struct {
72			__u8	type;
73		} mht;
74	} uli_u;
75#define fl_ip_sport	uli_u.ports.sport
76#define fl_ip_dport	uli_u.ports.dport
77#define fl_icmp_type	uli_u.icmpt.type
78#define fl_icmp_code	uli_u.icmpt.code
79#define fl_ipsec_spi	uli_u.spi
80#define fl_mh_type	uli_u.mht.type
81	__u32           secid;	/* used by xfrm; see secid.txt */
82} __attribute__((__aligned__(BITS_PER_LONG/8)));
83
84#define FLOW_DIR_IN	0
85#define FLOW_DIR_OUT	1
86#define FLOW_DIR_FWD	2
87
88struct net;
89struct sock;
90struct flow_cache_ops;
91
92struct flow_cache_object {
93	const struct flow_cache_ops *ops;
94};
95
96struct flow_cache_ops {
97	struct flow_cache_object *(*get)(struct flow_cache_object *);
98	int (*check)(struct flow_cache_object *);
99	void (*delete)(struct flow_cache_object *);
100};
101
102typedef struct flow_cache_object *(*flow_resolve_t)(
103		struct net *net, struct flowi *key, u16 family,
104		u8 dir, struct flow_cache_object *oldobj, void *ctx);
105
106extern struct flow_cache_object *flow_cache_lookup(
107		struct net *net, struct flowi *key, u16 family,
108		u8 dir, flow_resolve_t resolver, void *ctx);
109
110extern void flow_cache_flush(void);
111extern atomic_t flow_cache_genid;
112
113static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
114{
115	return (fl1->proto == fl2->proto &&
116		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
117}
118
119#endif
120