flow.h revision fe1a5f031e76bd8761a7803d75b95ee96e84a574 
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	union {
53		struct {
54			__be16	sport;
55			__be16	dport;
56		} ports;
57
58		struct {
59			__u8	type;
60			__u8	code;
61		} icmpt;
62
63		struct {
64			__le16	sport;
65			__le16	dport;
66		} dnports;
67
68		__be32		spi;
69
70		struct {
71			__u8	type;
72		} mht;
73	} uli_u;
74#define fl_ip_sport	uli_u.ports.sport
75#define fl_ip_dport	uli_u.ports.dport
76#define fl_icmp_type	uli_u.icmpt.type
77#define fl_icmp_code	uli_u.icmpt.code
78#define fl_ipsec_spi	uli_u.spi
79#define fl_mh_type	uli_u.mht.type
80	__u32           secid;	/* used by xfrm; see secid.txt */
81} __attribute__((__aligned__(BITS_PER_LONG/8)));
82
83#define FLOW_DIR_IN	0
84#define FLOW_DIR_OUT	1
85#define FLOW_DIR_FWD	2
86
87struct net;
88struct sock;
89struct flow_cache_ops;
90
91struct flow_cache_object {
92	const struct flow_cache_ops *ops;
93};
94
95struct flow_cache_ops {
96	struct flow_cache_object *(*get)(struct flow_cache_object *);
97	int (*check)(struct flow_cache_object *);
98	void (*delete)(struct flow_cache_object *);
99};
100
101typedef struct flow_cache_object *(*flow_resolve_t)(
102		struct net *net, struct flowi *key, u16 family,
103		u8 dir, struct flow_cache_object *oldobj, void *ctx);
104
105extern struct flow_cache_object *flow_cache_lookup(
106		struct net *net, struct flowi *key, u16 family,
107		u8 dir, flow_resolve_t resolver, void *ctx);
108
109extern void flow_cache_flush(void);
110extern atomic_t flow_cache_genid;
111
112static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
113{
114	return (fl1->proto == fl2->proto &&
115		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
116}
117
118#endif
119