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TOMOYO Linux Cross Reference
Linux/include/net/flow.h

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  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 #include <net/flow_dissector.h>
 14 #include <linux/uidgid.h>
 15 
 16 /*
 17  * ifindex generation is per-net namespace, and loopback is
 18  * always the 1st device in ns (see net_dev_init), thus any
 19  * loopback device should get ifindex 1
 20  */
 21 
 22 #define LOOPBACK_IFINDEX        1
 23 
 24 struct flowi_tunnel {
 25         __be64                  tun_id;
 26 };
 27 
 28 struct flowi_common {
 29         int     flowic_oif;
 30         int     flowic_iif;
 31         __u32   flowic_mark;
 32         __u8    flowic_tos;
 33         __u8    flowic_scope;
 34         __u8    flowic_proto;
 35         __u8    flowic_flags;
 36 #define FLOWI_FLAG_ANYSRC               0x01
 37 #define FLOWI_FLAG_KNOWN_NH             0x02
 38 #define FLOWI_FLAG_SKIP_NH_OIF          0x04
 39         __u32   flowic_secid;
 40         struct flowi_tunnel flowic_tun_key;
 41         kuid_t  flowic_uid;
 42 };
 43 
 44 union flowi_uli {
 45         struct {
 46                 __be16  dport;
 47                 __be16  sport;
 48         } ports;
 49 
 50         struct {
 51                 __u8    type;
 52                 __u8    code;
 53         } icmpt;
 54 
 55         struct {
 56                 __le16  dport;
 57                 __le16  sport;
 58         } dnports;
 59 
 60         __be32          spi;
 61         __be32          gre_key;
 62 
 63         struct {
 64                 __u8    type;
 65         } mht;
 66 };
 67 
 68 struct flowi4 {
 69         struct flowi_common     __fl_common;
 70 #define flowi4_oif              __fl_common.flowic_oif
 71 #define flowi4_iif              __fl_common.flowic_iif
 72 #define flowi4_mark             __fl_common.flowic_mark
 73 #define flowi4_tos              __fl_common.flowic_tos
 74 #define flowi4_scope            __fl_common.flowic_scope
 75 #define flowi4_proto            __fl_common.flowic_proto
 76 #define flowi4_flags            __fl_common.flowic_flags
 77 #define flowi4_secid            __fl_common.flowic_secid
 78 #define flowi4_tun_key          __fl_common.flowic_tun_key
 79 #define flowi4_uid              __fl_common.flowic_uid
 80 
 81         /* (saddr,daddr) must be grouped, same order as in IP header */
 82         __be32                  saddr;
 83         __be32                  daddr;
 84 
 85         union flowi_uli         uli;
 86 #define fl4_sport               uli.ports.sport
 87 #define fl4_dport               uli.ports.dport
 88 #define fl4_icmp_type           uli.icmpt.type
 89 #define fl4_icmp_code           uli.icmpt.code
 90 #define fl4_ipsec_spi           uli.spi
 91 #define fl4_mh_type             uli.mht.type
 92 #define fl4_gre_key             uli.gre_key
 93 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 94 
 95 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
 96                                       __u32 mark, __u8 tos, __u8 scope,
 97                                       __u8 proto, __u8 flags,
 98                                       __be32 daddr, __be32 saddr,
 99                                       __be16 dport, __be16 sport,
100                                       kuid_t uid)
101 {
102         fl4->flowi4_oif = oif;
103         fl4->flowi4_iif = LOOPBACK_IFINDEX;
104         fl4->flowi4_mark = mark;
105         fl4->flowi4_tos = tos;
106         fl4->flowi4_scope = scope;
107         fl4->flowi4_proto = proto;
108         fl4->flowi4_flags = flags;
109         fl4->flowi4_secid = 0;
110         fl4->flowi4_tun_key.tun_id = 0;
111         fl4->flowi4_uid = uid;
112         fl4->daddr = daddr;
113         fl4->saddr = saddr;
114         fl4->fl4_dport = dport;
115         fl4->fl4_sport = sport;
116 }
117 
118 /* Reset some input parameters after previous lookup */
119 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
120                                         __be32 daddr, __be32 saddr)
121 {
122         fl4->flowi4_oif = oif;
123         fl4->flowi4_tos = tos;
124         fl4->daddr = daddr;
125         fl4->saddr = saddr;
126 }
127                                       
128 
129 struct flowi6 {
130         struct flowi_common     __fl_common;
131 #define flowi6_oif              __fl_common.flowic_oif
132 #define flowi6_iif              __fl_common.flowic_iif
133 #define flowi6_mark             __fl_common.flowic_mark
134 #define flowi6_scope            __fl_common.flowic_scope
135 #define flowi6_proto            __fl_common.flowic_proto
136 #define flowi6_flags            __fl_common.flowic_flags
137 #define flowi6_secid            __fl_common.flowic_secid
138 #define flowi6_tun_key          __fl_common.flowic_tun_key
139 #define flowi6_uid              __fl_common.flowic_uid
140         struct in6_addr         daddr;
141         struct in6_addr         saddr;
142         /* Note: flowi6_tos is encoded in flowlabel, too. */
143         __be32                  flowlabel;
144         union flowi_uli         uli;
145 #define fl6_sport               uli.ports.sport
146 #define fl6_dport               uli.ports.dport
147 #define fl6_icmp_type           uli.icmpt.type
148 #define fl6_icmp_code           uli.icmpt.code
149 #define fl6_ipsec_spi           uli.spi
150 #define fl6_mh_type             uli.mht.type
151 #define fl6_gre_key             uli.gre_key
152 } __attribute__((__aligned__(BITS_PER_LONG/8)));
153 
154 struct flowidn {
155         struct flowi_common     __fl_common;
156 #define flowidn_oif             __fl_common.flowic_oif
157 #define flowidn_iif             __fl_common.flowic_iif
158 #define flowidn_mark            __fl_common.flowic_mark
159 #define flowidn_scope           __fl_common.flowic_scope
160 #define flowidn_proto           __fl_common.flowic_proto
161 #define flowidn_flags           __fl_common.flowic_flags
162         __le16                  daddr;
163         __le16                  saddr;
164         union flowi_uli         uli;
165 #define fld_sport               uli.ports.sport
166 #define fld_dport               uli.ports.dport
167 } __attribute__((__aligned__(BITS_PER_LONG/8)));
168 
169 struct flowi {
170         union {
171                 struct flowi_common     __fl_common;
172                 struct flowi4           ip4;
173                 struct flowi6           ip6;
174                 struct flowidn          dn;
175         } u;
176 #define flowi_oif       u.__fl_common.flowic_oif
177 #define flowi_iif       u.__fl_common.flowic_iif
178 #define flowi_mark      u.__fl_common.flowic_mark
179 #define flowi_tos       u.__fl_common.flowic_tos
180 #define flowi_scope     u.__fl_common.flowic_scope
181 #define flowi_proto     u.__fl_common.flowic_proto
182 #define flowi_flags     u.__fl_common.flowic_flags
183 #define flowi_secid     u.__fl_common.flowic_secid
184 #define flowi_tun_key   u.__fl_common.flowic_tun_key
185 #define flowi_uid       u.__fl_common.flowic_uid
186 } __attribute__((__aligned__(BITS_PER_LONG/8)));
187 
188 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
189 {
190         return container_of(fl4, struct flowi, u.ip4);
191 }
192 
193 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
194 {
195         return container_of(fl6, struct flowi, u.ip6);
196 }
197 
198 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
199 {
200         return container_of(fldn, struct flowi, u.dn);
201 }
202 
203 typedef unsigned long flow_compare_t;
204 
205 static inline unsigned int flow_key_size(u16 family)
206 {
207         switch (family) {
208         case AF_INET:
209                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
210                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
211         case AF_INET6:
212                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
213                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
214         case AF_DECnet:
215                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
216                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
217         }
218         return 0;
219 }
220 
221 #define FLOW_DIR_IN     0
222 #define FLOW_DIR_OUT    1
223 #define FLOW_DIR_FWD    2
224 
225 struct net;
226 struct sock;
227 struct flow_cache_ops;
228 
229 struct flow_cache_object {
230         const struct flow_cache_ops *ops;
231 };
232 
233 struct flow_cache_ops {
234         struct flow_cache_object *(*get)(struct flow_cache_object *);
235         int (*check)(struct flow_cache_object *);
236         void (*delete)(struct flow_cache_object *);
237 };
238 
239 typedef struct flow_cache_object *(*flow_resolve_t)(
240                 struct net *net, const struct flowi *key, u16 family,
241                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
242 
243 struct flow_cache_object *flow_cache_lookup(struct net *net,
244                                             const struct flowi *key, u16 family,
245                                             u8 dir, flow_resolve_t resolver,
246                                             void *ctx);
247 int flow_cache_init(struct net *net);
248 void flow_cache_fini(struct net *net);
249 void flow_cache_hp_init(void);
250 
251 void flow_cache_flush(struct net *net);
252 void flow_cache_flush_deferred(struct net *net);
253 extern atomic_t flow_cache_genid;
254 
255 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
256 
257 static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6)
258 {
259         struct flow_keys keys;
260 
261         return __get_hash_from_flowi6(fl6, &keys);
262 }
263 
264 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys);
265 
266 static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4)
267 {
268         struct flow_keys keys;
269 
270         return __get_hash_from_flowi4(fl4, &keys);
271 }
272 
273 #endif
274 

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