ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif
[sfrench/cifs-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 /*
15  * ifindex generation is per-net namespace, and loopback is
16  * always the 1st device in ns (see net_dev_init), thus any
17  * loopback device should get ifindex 1
18  */
19
20 #define LOOPBACK_IFINDEX        1
21
22 struct flowi_common {
23         int     flowic_oif;
24         int     flowic_iif;
25         __u32   flowic_mark;
26         __u8    flowic_tos;
27         __u8    flowic_scope;
28         __u8    flowic_proto;
29         __u8    flowic_flags;
30 #define FLOWI_FLAG_ANYSRC               0x01
31 #define FLOWI_FLAG_KNOWN_NH             0x02
32         __u32   flowic_secid;
33 };
34
35 union flowi_uli {
36         struct {
37                 __be16  dport;
38                 __be16  sport;
39         } ports;
40
41         struct {
42                 __u8    type;
43                 __u8    code;
44         } icmpt;
45
46         struct {
47                 __le16  dport;
48                 __le16  sport;
49         } dnports;
50
51         __be32          spi;
52         __be32          gre_key;
53
54         struct {
55                 __u8    type;
56         } mht;
57 };
58
59 struct flowi4 {
60         struct flowi_common     __fl_common;
61 #define flowi4_oif              __fl_common.flowic_oif
62 #define flowi4_iif              __fl_common.flowic_iif
63 #define flowi4_mark             __fl_common.flowic_mark
64 #define flowi4_tos              __fl_common.flowic_tos
65 #define flowi4_scope            __fl_common.flowic_scope
66 #define flowi4_proto            __fl_common.flowic_proto
67 #define flowi4_flags            __fl_common.flowic_flags
68 #define flowi4_secid            __fl_common.flowic_secid
69
70         /* (saddr,daddr) must be grouped, same order as in IP header */
71         __be32                  saddr;
72         __be32                  daddr;
73
74         union flowi_uli         uli;
75 #define fl4_sport               uli.ports.sport
76 #define fl4_dport               uli.ports.dport
77 #define fl4_icmp_type           uli.icmpt.type
78 #define fl4_icmp_code           uli.icmpt.code
79 #define fl4_ipsec_spi           uli.spi
80 #define fl4_mh_type             uli.mht.type
81 #define fl4_gre_key             uli.gre_key
82 } __attribute__((__aligned__(BITS_PER_LONG/8)));
83
84 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
85                                       __u32 mark, __u8 tos, __u8 scope,
86                                       __u8 proto, __u8 flags,
87                                       __be32 daddr, __be32 saddr,
88                                       __be16 dport, __be16 sport)
89 {
90         fl4->flowi4_oif = oif;
91         fl4->flowi4_iif = LOOPBACK_IFINDEX;
92         fl4->flowi4_mark = mark;
93         fl4->flowi4_tos = tos;
94         fl4->flowi4_scope = scope;
95         fl4->flowi4_proto = proto;
96         fl4->flowi4_flags = flags;
97         fl4->flowi4_secid = 0;
98         fl4->daddr = daddr;
99         fl4->saddr = saddr;
100         fl4->fl4_dport = dport;
101         fl4->fl4_sport = sport;
102 }
103
104 /* Reset some input parameters after previous lookup */
105 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
106                                         __be32 daddr, __be32 saddr)
107 {
108         fl4->flowi4_oif = oif;
109         fl4->flowi4_tos = tos;
110         fl4->daddr = daddr;
111         fl4->saddr = saddr;
112 }
113                                       
114
115 struct flowi6 {
116         struct flowi_common     __fl_common;
117 #define flowi6_oif              __fl_common.flowic_oif
118 #define flowi6_iif              __fl_common.flowic_iif
119 #define flowi6_mark             __fl_common.flowic_mark
120 #define flowi6_tos              __fl_common.flowic_tos
121 #define flowi6_scope            __fl_common.flowic_scope
122 #define flowi6_proto            __fl_common.flowic_proto
123 #define flowi6_flags            __fl_common.flowic_flags
124 #define flowi6_secid            __fl_common.flowic_secid
125         struct in6_addr         daddr;
126         struct in6_addr         saddr;
127         __be32                  flowlabel;
128         union flowi_uli         uli;
129 #define fl6_sport               uli.ports.sport
130 #define fl6_dport               uli.ports.dport
131 #define fl6_icmp_type           uli.icmpt.type
132 #define fl6_icmp_code           uli.icmpt.code
133 #define fl6_ipsec_spi           uli.spi
134 #define fl6_mh_type             uli.mht.type
135 #define fl6_gre_key             uli.gre_key
136 } __attribute__((__aligned__(BITS_PER_LONG/8)));
137
138 struct flowidn {
139         struct flowi_common     __fl_common;
140 #define flowidn_oif             __fl_common.flowic_oif
141 #define flowidn_iif             __fl_common.flowic_iif
142 #define flowidn_mark            __fl_common.flowic_mark
143 #define flowidn_scope           __fl_common.flowic_scope
144 #define flowidn_proto           __fl_common.flowic_proto
145 #define flowidn_flags           __fl_common.flowic_flags
146         __le16                  daddr;
147         __le16                  saddr;
148         union flowi_uli         uli;
149 #define fld_sport               uli.ports.sport
150 #define fld_dport               uli.ports.dport
151 } __attribute__((__aligned__(BITS_PER_LONG/8)));
152
153 struct flowi {
154         union {
155                 struct flowi_common     __fl_common;
156                 struct flowi4           ip4;
157                 struct flowi6           ip6;
158                 struct flowidn          dn;
159         } u;
160 #define flowi_oif       u.__fl_common.flowic_oif
161 #define flowi_iif       u.__fl_common.flowic_iif
162 #define flowi_mark      u.__fl_common.flowic_mark
163 #define flowi_tos       u.__fl_common.flowic_tos
164 #define flowi_scope     u.__fl_common.flowic_scope
165 #define flowi_proto     u.__fl_common.flowic_proto
166 #define flowi_flags     u.__fl_common.flowic_flags
167 #define flowi_secid     u.__fl_common.flowic_secid
168 } __attribute__((__aligned__(BITS_PER_LONG/8)));
169
170 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
171 {
172         return container_of(fl4, struct flowi, u.ip4);
173 }
174
175 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
176 {
177         return container_of(fl6, struct flowi, u.ip6);
178 }
179
180 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
181 {
182         return container_of(fldn, struct flowi, u.dn);
183 }
184
185 typedef unsigned long flow_compare_t;
186
187 static inline size_t flow_key_size(u16 family)
188 {
189         switch (family) {
190         case AF_INET:
191                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
192                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
193         case AF_INET6:
194                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
195                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
196         case AF_DECnet:
197                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
198                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
199         }
200         return 0;
201 }
202
203 #define FLOW_DIR_IN     0
204 #define FLOW_DIR_OUT    1
205 #define FLOW_DIR_FWD    2
206
207 struct net;
208 struct sock;
209 struct flow_cache_ops;
210
211 struct flow_cache_object {
212         const struct flow_cache_ops *ops;
213 };
214
215 struct flow_cache_ops {
216         struct flow_cache_object *(*get)(struct flow_cache_object *);
217         int (*check)(struct flow_cache_object *);
218         void (*delete)(struct flow_cache_object *);
219 };
220
221 typedef struct flow_cache_object *(*flow_resolve_t)(
222                 struct net *net, const struct flowi *key, u16 family,
223                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
224
225 struct flow_cache_object *flow_cache_lookup(struct net *net,
226                                             const struct flowi *key, u16 family,
227                                             u8 dir, flow_resolve_t resolver,
228                                             void *ctx);
229 int flow_cache_init(struct net *net);
230 void flow_cache_fini(struct net *net);
231
232 void flow_cache_flush(struct net *net);
233 void flow_cache_flush_deferred(struct net *net);
234 extern atomic_t flow_cache_genid;
235
236 #endif