flow.h revision 2b741653b6c824fe7520ee92b6795f11c5f24b24 
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			__u32			daddr;
20			__u32			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			flowlabel;
30		} ip6_u;
31
32		struct {
33			__le16			daddr;
34			__le16			saddr;
35			__u32			fwmark;
36			__u8			scope;
37		} dn_u;
38	} nl_u;
39#define fld_dst		nl_u.dn_u.daddr
40#define fld_src		nl_u.dn_u.saddr
41#define fld_fwmark	nl_u.dn_u.fwmark
42#define fld_scope	nl_u.dn_u.scope
43#define fl6_dst		nl_u.ip6_u.daddr
44#define fl6_src		nl_u.ip6_u.saddr
45#define fl6_flowlabel	nl_u.ip6_u.flowlabel
46#define fl4_dst		nl_u.ip4_u.daddr
47#define fl4_src		nl_u.ip4_u.saddr
48#define fl4_fwmark	nl_u.ip4_u.fwmark
49#define fl4_tos		nl_u.ip4_u.tos
50#define fl4_scope	nl_u.ip4_u.scope
51
52	__u8	proto;
53	__u8	flags;
54#define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01
55	union {
56		struct {
57			__u16	sport;
58			__u16	dport;
59		} ports;
60
61		struct {
62			__u8	type;
63			__u8	code;
64		} icmpt;
65
66		struct {
67			__le16	sport;
68			__le16	dport;
69			__u8	objnum;
70			__u8	objnamel; /* Not 16 bits since max val is 16 */
71			__u8	objname[16]; /* Not zero terminated */
72		} dnports;
73
74		__u32		spi;
75
76#ifdef CONFIG_IPV6_MIP6
77		struct {
78			__u8	type;
79		} mht;
80#endif
81	} uli_u;
82#define fl_ip_sport	uli_u.ports.sport
83#define fl_ip_dport	uli_u.ports.dport
84#define fl_icmp_type	uli_u.icmpt.type
85#define fl_icmp_code	uli_u.icmpt.code
86#define fl_ipsec_spi	uli_u.spi
87#ifdef CONFIG_IPV6_MIP6
88#define fl_mh_type	uli_u.mht.type
89#endif
90	__u32           secid;	/* used by xfrm; see secid.txt */
91} __attribute__((__aligned__(BITS_PER_LONG/8)));
92
93#define FLOW_DIR_IN	0
94#define FLOW_DIR_OUT	1
95#define FLOW_DIR_FWD	2
96
97struct sock;
98typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
99			       void **objp, atomic_t **obj_refp);
100
101extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
102	 		       flow_resolve_t resolver);
103extern void flow_cache_flush(void);
104extern atomic_t flow_cache_genid;
105
106#endif
107