flow.h revision 61f1ab41b8ede8e2a26c349a4e3372100545c5ec 
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	union {
52		struct {
53			__be16	sport;
54			__be16	dport;
55		} ports;
56
57		struct {
58			__u8	type;
59			__u8	code;
60		} icmpt;
61
62		struct {
63			__le16	sport;
64			__le16	dport;
65		} dnports;
66
67		__be32		spi;
68
69		struct {
70			__u8	type;
71		} mht;
72	} uli_u;
73#define fl_ip_sport	uli_u.ports.sport
74#define fl_ip_dport	uli_u.ports.dport
75#define fl_icmp_type	uli_u.icmpt.type
76#define fl_icmp_code	uli_u.icmpt.code
77#define fl_ipsec_spi	uli_u.spi
78#define fl_mh_type	uli_u.mht.type
79	__u32           secid;	/* used by xfrm; see secid.txt */
80} __attribute__((__aligned__(BITS_PER_LONG/8)));
81
82#define FLOW_DIR_IN	0
83#define FLOW_DIR_OUT	1
84#define FLOW_DIR_FWD	2
85
86struct sock;
87typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
88			       void **objp, atomic_t **obj_refp);
89
90extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
91	 		       flow_resolve_t resolver);
92extern void flow_cache_flush(void);
93extern atomic_t flow_cache_genid;
94
95static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
96{
97	return (fl1->proto == fl2->proto &&
98		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
99}
100
101#endif
102