Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[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_common {
14         int     flowic_oif;
15         int     flowic_iif;
16         __u32   flowic_mark;
17         __u8    flowic_tos;
18         __u8    flowic_scope;
19         __u8    flowic_proto;
20         __u8    flowic_flags;
21 #define FLOWI_FLAG_ANYSRC               0x01
22 #define FLOWI_FLAG_PRECOW_METRICS       0x02
23 #define FLOWI_FLAG_CAN_SLEEP            0x04
24         __u32   flowic_secid;
25 };
26
27 union flowi_uli {
28         struct {
29                 __be16  dport;
30                 __be16  sport;
31         } ports;
32
33         struct {
34                 __u8    type;
35                 __u8    code;
36         } icmpt;
37
38         struct {
39                 __le16  dport;
40                 __le16  sport;
41         } dnports;
42
43         __be32          spi;
44         __be32          gre_key;
45
46         struct {
47                 __u8    type;
48         } mht;
49 };
50
51 struct flowi4 {
52         struct flowi_common     __fl_common;
53 #define flowi4_oif              __fl_common.flowic_oif
54 #define flowi4_iif              __fl_common.flowic_iif
55 #define flowi4_mark             __fl_common.flowic_mark
56 #define flowi4_tos              __fl_common.flowic_tos
57 #define flowi4_scope            __fl_common.flowic_scope
58 #define flowi4_proto            __fl_common.flowic_proto
59 #define flowi4_flags            __fl_common.flowic_flags
60 #define flowi4_secid            __fl_common.flowic_secid
61         __be32                  daddr;
62         __be32                  saddr;
63         union flowi_uli         uli;
64 #define fl4_sport               uli.ports.sport
65 #define fl4_dport               uli.ports.dport
66 #define fl4_icmp_type           uli.icmpt.type
67 #define fl4_icmp_code           uli.icmpt.code
68 #define fl4_ipsec_spi           uli.spi
69 #define fl4_mh_type             uli.mht.type
70 #define fl4_gre_key             uli.gre_key
71 };
72
73 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
74                                       __u32 mark, __u8 tos, __u8 scope,
75                                       __u8 proto, __u8 flags,
76                                       __be32 daddr, __be32 saddr,
77                                       __be16 dport, __be32 sport)
78 {
79         fl4->flowi4_oif = oif;
80         fl4->flowi4_iif = 0;
81         fl4->flowi4_mark = mark;
82         fl4->flowi4_tos = tos;
83         fl4->flowi4_scope = scope;
84         fl4->flowi4_proto = proto;
85         fl4->flowi4_flags = flags;
86         fl4->flowi4_secid = 0;
87         fl4->daddr = daddr;
88         fl4->saddr = saddr;
89         fl4->fl4_dport = dport;
90         fl4->fl4_sport = sport;
91 }
92                                       
93
94 struct flowi6 {
95         struct flowi_common     __fl_common;
96 #define flowi6_oif              __fl_common.flowic_oif
97 #define flowi6_iif              __fl_common.flowic_iif
98 #define flowi6_mark             __fl_common.flowic_mark
99 #define flowi6_tos              __fl_common.flowic_tos
100 #define flowi6_scope            __fl_common.flowic_scope
101 #define flowi6_proto            __fl_common.flowic_proto
102 #define flowi6_flags            __fl_common.flowic_flags
103 #define flowi6_secid            __fl_common.flowic_secid
104         struct in6_addr         daddr;
105         struct in6_addr         saddr;
106         __be32                  flowlabel;
107         union flowi_uli         uli;
108 #define fl6_sport               uli.ports.sport
109 #define fl6_dport               uli.ports.dport
110 #define fl6_icmp_type           uli.icmpt.type
111 #define fl6_icmp_code           uli.icmpt.code
112 #define fl6_ipsec_spi           uli.spi
113 #define fl6_mh_type             uli.mht.type
114 #define fl6_gre_key             uli.gre_key
115 };
116
117 struct flowidn {
118         struct flowi_common     __fl_common;
119 #define flowidn_oif             __fl_common.flowic_oif
120 #define flowidn_iif             __fl_common.flowic_iif
121 #define flowidn_mark            __fl_common.flowic_mark
122 #define flowidn_scope           __fl_common.flowic_scope
123 #define flowidn_proto           __fl_common.flowic_proto
124 #define flowidn_flags           __fl_common.flowic_flags
125         __le16                  daddr;
126         __le16                  saddr;
127         union flowi_uli         uli;
128 #define fld_sport               uli.ports.sport
129 #define fld_dport               uli.ports.dport
130 };
131
132 struct flowi {
133         union {
134                 struct flowi_common     __fl_common;
135                 struct flowi4           ip4;
136                 struct flowi6           ip6;
137                 struct flowidn          dn;
138         } u;
139 #define flowi_oif       u.__fl_common.flowic_oif
140 #define flowi_iif       u.__fl_common.flowic_iif
141 #define flowi_mark      u.__fl_common.flowic_mark
142 #define flowi_tos       u.__fl_common.flowic_tos
143 #define flowi_scope     u.__fl_common.flowic_scope
144 #define flowi_proto     u.__fl_common.flowic_proto
145 #define flowi_flags     u.__fl_common.flowic_flags
146 #define flowi_secid     u.__fl_common.flowic_secid
147 } __attribute__((__aligned__(BITS_PER_LONG/8)));
148
149 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
150 {
151         return container_of(fl4, struct flowi, u.ip4);
152 }
153
154 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
155 {
156         return container_of(fl6, struct flowi, u.ip6);
157 }
158
159 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
160 {
161         return container_of(fldn, struct flowi, u.dn);
162 }
163
164 #define FLOW_DIR_IN     0
165 #define FLOW_DIR_OUT    1
166 #define FLOW_DIR_FWD    2
167
168 struct net;
169 struct sock;
170 struct flow_cache_ops;
171
172 struct flow_cache_object {
173         const struct flow_cache_ops *ops;
174 };
175
176 struct flow_cache_ops {
177         struct flow_cache_object *(*get)(struct flow_cache_object *);
178         int (*check)(struct flow_cache_object *);
179         void (*delete)(struct flow_cache_object *);
180 };
181
182 typedef struct flow_cache_object *(*flow_resolve_t)(
183                 struct net *net, const struct flowi *key, u16 family,
184                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
185
186 extern struct flow_cache_object *flow_cache_lookup(
187                 struct net *net, const struct flowi *key, u16 family,
188                 u8 dir, flow_resolve_t resolver, void *ctx);
189
190 extern void flow_cache_flush(void);
191 extern atomic_t flow_cache_genid;
192
193 #endif