9a5c94b1a0eca9d703ed72d8c8474b274db94a80
[linux-2.6.git] / include / net / flow.h
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
13 struct 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                         __u16                   daddr;
34                         __u16                   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                         __u16   sport;
68                         __u16   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         } 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 } __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
87 typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
88                                void **objp, atomic_t **obj_refp);
89
90 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
91                                flow_resolve_t resolver);
92 extern void flow_cache_flush(void);
93 extern atomic_t flow_cache_genid;
94
95 #endif