Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/linville/wireles...
[linux-2.6] / 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         __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
86 struct sock;
87 typedef int (*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 static 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