flow.h revision 157bfc25020f7eb731f94140e099307ade47299e 
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_MULTIPATHOLDROUTE 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#ifdef CONFIG_IPV6_MIP6
71		struct {
72			__u8	type;
73		} mht;
74#endif
75	} uli_u;
76#define fl_ip_sport	uli_u.ports.sport
77#define fl_ip_dport	uli_u.ports.dport
78#define fl_icmp_type	uli_u.icmpt.type
79#define fl_icmp_code	uli_u.icmpt.code
80#define fl_ipsec_spi	uli_u.spi
81#ifdef CONFIG_IPV6_MIP6
82#define fl_mh_type	uli_u.mht.type
83#endif
84	__u32           secid;	/* used by xfrm; see secid.txt */
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 sock;
92typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
93			       void **objp, atomic_t **obj_refp);
94
95extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
96	 		       flow_resolve_t resolver);
97extern void flow_cache_flush(void);
98extern atomic_t flow_cache_genid;
99
100static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
101{
102	return (fl1->proto == fl2->proto &&
103		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
104}
105
106#endif
107