flow.h revision 185b1aa122f87052d9154bb74990bc785372a750 
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
17	union {
18		struct {
19			__be32			daddr;
20			__be32			saddr;
21			__u32			fwmark;
22			__u8			tos;
23			__u8			scope;
24		} ip4_u;
25
26		struct {
27			struct in6_addr		daddr;
28			struct in6_addr		saddr;
29			__u32			fwmark;
30			__u32			flowlabel;
31		} ip6_u;
32
33		struct {
34			__le16			daddr;
35			__le16			saddr;
36			__u32			fwmark;
37			__u8			scope;
38		} dn_u;
39	} nl_u;
40#define fld_dst		nl_u.dn_u.daddr
41#define fld_src		nl_u.dn_u.saddr
42#define fld_fwmark	nl_u.dn_u.fwmark
43#define fld_scope	nl_u.dn_u.scope
44#define fl6_dst		nl_u.ip6_u.daddr
45#define fl6_src		nl_u.ip6_u.saddr
46#define fl6_fwmark	nl_u.ip6_u.fwmark
47#define fl6_flowlabel	nl_u.ip6_u.flowlabel
48#define fl4_dst		nl_u.ip4_u.daddr
49#define fl4_src		nl_u.ip4_u.saddr
50#define fl4_fwmark	nl_u.ip4_u.fwmark
51#define fl4_tos		nl_u.ip4_u.tos
52#define fl4_scope	nl_u.ip4_u.scope
53
54	__u8	proto;
55	__u8	flags;
56#define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01
57	union {
58		struct {
59			__be16	sport;
60			__be16	dport;
61		} ports;
62
63		struct {
64			__u8	type;
65			__u8	code;
66		} icmpt;
67
68		struct {
69			__le16	sport;
70			__le16	dport;
71		} dnports;
72
73		__be32		spi;
74
75#ifdef CONFIG_IPV6_MIP6
76		struct {
77			__u8	type;
78		} mht;
79#endif
80	} uli_u;
81#define fl_ip_sport	uli_u.ports.sport
82#define fl_ip_dport	uli_u.ports.dport
83#define fl_icmp_type	uli_u.icmpt.type
84#define fl_icmp_code	uli_u.icmpt.code
85#define fl_ipsec_spi	uli_u.spi
86#ifdef CONFIG_IPV6_MIP6
87#define fl_mh_type	uli_u.mht.type
88#endif
89	__u32           secid;	/* used by xfrm; see secid.txt */
90} __attribute__((__aligned__(BITS_PER_LONG/8)));
91
92#define FLOW_DIR_IN	0
93#define FLOW_DIR_OUT	1
94#define FLOW_DIR_FWD	2
95
96struct sock;
97typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
98			       void **objp, atomic_t **obj_refp);
99
100extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
101	 		       flow_resolve_t resolver);
102extern void flow_cache_flush(void);
103extern atomic_t flow_cache_genid;
104
105#endif
106