Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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/socket.h>
11 #include <linux/in6.h>
12 #include <linux/atomic.h>
13
14 struct flowi_common {
15         int     flowic_oif;
16         int     flowic_iif;
17         __u32   flowic_mark;
18         __u8    flowic_tos;
19         __u8    flowic_scope;
20         __u8    flowic_proto;
21         __u8    flowic_flags;
22 #define FLOWI_FLAG_ANYSRC               0x01
23 #define FLOWI_FLAG_PRECOW_METRICS       0x02
24 #define FLOWI_FLAG_CAN_SLEEP            0x04
25         __u32   flowic_secid;
26 };
27
28 union flowi_uli {
29         struct {
30                 __be16  dport;
31                 __be16  sport;
32         } ports;
33
34         struct {
35                 __u8    type;
36                 __u8    code;
37         } icmpt;
38
39         struct {
40                 __le16  dport;
41                 __le16  sport;
42         } dnports;
43
44         __be32          spi;
45         __be32          gre_key;
46
47         struct {
48                 __u8    type;
49         } mht;
50 };
51
52 struct flowi4 {
53         struct flowi_common     __fl_common;
54 #define flowi4_oif              __fl_common.flowic_oif
55 #define flowi4_iif              __fl_common.flowic_iif
56 #define flowi4_mark             __fl_common.flowic_mark
57 #define flowi4_tos              __fl_common.flowic_tos
58 #define flowi4_scope            __fl_common.flowic_scope
59 #define flowi4_proto            __fl_common.flowic_proto
60 #define flowi4_flags            __fl_common.flowic_flags
61 #define flowi4_secid            __fl_common.flowic_secid
62
63         /* (saddr,daddr) must be grouped, same order as in IP header */
64         __be32                  saddr;
65         __be32                  daddr;
66
67         union flowi_uli         uli;
68 #define fl4_sport               uli.ports.sport
69 #define fl4_dport               uli.ports.dport
70 #define fl4_icmp_type           uli.icmpt.type
71 #define fl4_icmp_code           uli.icmpt.code
72 #define fl4_ipsec_spi           uli.spi
73 #define fl4_mh_type             uli.mht.type
74 #define fl4_gre_key             uli.gre_key
75 } __attribute__((__aligned__(BITS_PER_LONG/8)));
76
77 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
78                                       __u32 mark, __u8 tos, __u8 scope,
79                                       __u8 proto, __u8 flags,
80                                       __be32 daddr, __be32 saddr,
81                                       __be16 dport, __be32 sport)
82 {
83         fl4->flowi4_oif = oif;
84         fl4->flowi4_iif = 0;
85         fl4->flowi4_mark = mark;
86         fl4->flowi4_tos = tos;
87         fl4->flowi4_scope = scope;
88         fl4->flowi4_proto = proto;
89         fl4->flowi4_flags = flags;
90         fl4->flowi4_secid = 0;
91         fl4->daddr = daddr;
92         fl4->saddr = saddr;
93         fl4->fl4_dport = dport;
94         fl4->fl4_sport = sport;
95 }
96                                       
97
98 struct flowi6 {
99         struct flowi_common     __fl_common;
100 #define flowi6_oif              __fl_common.flowic_oif
101 #define flowi6_iif              __fl_common.flowic_iif
102 #define flowi6_mark             __fl_common.flowic_mark
103 #define flowi6_tos              __fl_common.flowic_tos
104 #define flowi6_scope            __fl_common.flowic_scope
105 #define flowi6_proto            __fl_common.flowic_proto
106 #define flowi6_flags            __fl_common.flowic_flags
107 #define flowi6_secid            __fl_common.flowic_secid
108         struct in6_addr         daddr;
109         struct in6_addr         saddr;
110         __be32                  flowlabel;
111         union flowi_uli         uli;
112 #define fl6_sport               uli.ports.sport
113 #define fl6_dport               uli.ports.dport
114 #define fl6_icmp_type           uli.icmpt.type
115 #define fl6_icmp_code           uli.icmpt.code
116 #define fl6_ipsec_spi           uli.spi
117 #define fl6_mh_type             uli.mht.type
118 #define fl6_gre_key             uli.gre_key
119 } __attribute__((__aligned__(BITS_PER_LONG/8)));
120
121 struct flowidn {
122         struct flowi_common     __fl_common;
123 #define flowidn_oif             __fl_common.flowic_oif
124 #define flowidn_iif             __fl_common.flowic_iif
125 #define flowidn_mark            __fl_common.flowic_mark
126 #define flowidn_scope           __fl_common.flowic_scope
127 #define flowidn_proto           __fl_common.flowic_proto
128 #define flowidn_flags           __fl_common.flowic_flags
129         __le16                  daddr;
130         __le16                  saddr;
131         union flowi_uli         uli;
132 #define fld_sport               uli.ports.sport
133 #define fld_dport               uli.ports.dport
134 } __attribute__((__aligned__(BITS_PER_LONG/8)));
135
136 struct flowi {
137         union {
138                 struct flowi_common     __fl_common;
139                 struct flowi4           ip4;
140                 struct flowi6           ip6;
141                 struct flowidn          dn;
142         } u;
143 #define flowi_oif       u.__fl_common.flowic_oif
144 #define flowi_iif       u.__fl_common.flowic_iif
145 #define flowi_mark      u.__fl_common.flowic_mark
146 #define flowi_tos       u.__fl_common.flowic_tos
147 #define flowi_scope     u.__fl_common.flowic_scope
148 #define flowi_proto     u.__fl_common.flowic_proto
149 #define flowi_flags     u.__fl_common.flowic_flags
150 #define flowi_secid     u.__fl_common.flowic_secid
151 } __attribute__((__aligned__(BITS_PER_LONG/8)));
152
153 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
154 {
155         return container_of(fl4, struct flowi, u.ip4);
156 }
157
158 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
159 {
160         return container_of(fl6, struct flowi, u.ip6);
161 }
162
163 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
164 {
165         return container_of(fldn, struct flowi, u.dn);
166 }
167
168 typedef unsigned long flow_compare_t;
169
170 static inline size_t flow_key_size(u16 family)
171 {
172         switch (family) {
173         case AF_INET:
174                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
175                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
176         case AF_INET6:
177                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
178                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
179         case AF_DECnet:
180                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
181                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
182         }
183         return 0;
184 }
185
186 #define FLOW_DIR_IN     0
187 #define FLOW_DIR_OUT    1
188 #define FLOW_DIR_FWD    2
189
190 struct net;
191 struct sock;
192 struct flow_cache_ops;
193
194 struct flow_cache_object {
195         const struct flow_cache_ops *ops;
196 };
197
198 struct flow_cache_ops {
199         struct flow_cache_object *(*get)(struct flow_cache_object *);
200         int (*check)(struct flow_cache_object *);
201         void (*delete)(struct flow_cache_object *);
202 };
203
204 typedef struct flow_cache_object *(*flow_resolve_t)(
205                 struct net *net, const struct flowi *key, u16 family,
206                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
207
208 extern struct flow_cache_object *flow_cache_lookup(
209                 struct net *net, const struct flowi *key, u16 family,
210                 u8 dir, flow_resolve_t resolver, void *ctx);
211
212 extern void flow_cache_flush(void);
213 extern void flow_cache_flush_deferred(void);
214 extern atomic_t flow_cache_genid;
215
216 #endif