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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *
  4  *      Generic internet FLOW.
  5  *
  6  */
  7 
  8 #ifndef _NET_FLOW_H
  9 #define _NET_FLOW_H
 10 
 11 #include <linux/socket.h>
 12 #include <linux/in6.h>
 13 #include <linux/atomic.h>
 14 #include <net/flow_dissector.h>
 15 #include <linux/uidgid.h>
 16 
 17 /*
 18  * ifindex generation is per-net namespace, and loopback is
 19  * always the 1st device in ns (see net_dev_init), thus any
 20  * loopback device should get ifindex 1
 21  */
 22 
 23 #define LOOPBACK_IFINDEX        1
 24 
 25 struct flowi_tunnel {
 26         __be64                  tun_id;
 27 };
 28 
 29 struct flowi_common {
 30         int     flowic_oif;
 31         int     flowic_iif;
 32         __u32   flowic_mark;
 33         __u8    flowic_tos;
 34         __u8    flowic_scope;
 35         __u8    flowic_proto;
 36         __u8    flowic_flags;
 37 #define FLOWI_FLAG_ANYSRC               0x01
 38 #define FLOWI_FLAG_KNOWN_NH             0x02
 39 #define FLOWI_FLAG_SKIP_NH_OIF          0x04
 40         __u32   flowic_secid;
 41         kuid_t  flowic_uid;
 42         struct flowi_tunnel flowic_tun_key;
 43         __u32           flowic_multipath_hash;
 44 };
 45 
 46 union flowi_uli {
 47         struct {
 48                 __be16  dport;
 49                 __be16  sport;
 50         } ports;
 51 
 52         struct {
 53                 __u8    type;
 54                 __u8    code;
 55         } icmpt;
 56 
 57         struct {
 58                 __le16  dport;
 59                 __le16  sport;
 60         } dnports;
 61 
 62         __be32          spi;
 63         __be32          gre_key;
 64 
 65         struct {
 66                 __u8    type;
 67         } mht;
 68 };
 69 
 70 struct flowi4 {
 71         struct flowi_common     __fl_common;
 72 #define flowi4_oif              __fl_common.flowic_oif
 73 #define flowi4_iif              __fl_common.flowic_iif
 74 #define flowi4_mark             __fl_common.flowic_mark
 75 #define flowi4_tos              __fl_common.flowic_tos
 76 #define flowi4_scope            __fl_common.flowic_scope
 77 #define flowi4_proto            __fl_common.flowic_proto
 78 #define flowi4_flags            __fl_common.flowic_flags
 79 #define flowi4_secid            __fl_common.flowic_secid
 80 #define flowi4_tun_key          __fl_common.flowic_tun_key
 81 #define flowi4_uid              __fl_common.flowic_uid
 82 #define flowi4_multipath_hash   __fl_common.flowic_multipath_hash
 83 
 84         /* (saddr,daddr) must be grouped, same order as in IP header */
 85         __be32                  saddr;
 86         __be32                  daddr;
 87 
 88         union flowi_uli         uli;
 89 #define fl4_sport               uli.ports.sport
 90 #define fl4_dport               uli.ports.dport
 91 #define fl4_icmp_type           uli.icmpt.type
 92 #define fl4_icmp_code           uli.icmpt.code
 93 #define fl4_ipsec_spi           uli.spi
 94 #define fl4_mh_type             uli.mht.type
 95 #define fl4_gre_key             uli.gre_key
 96 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 97 
 98 static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
 99                                       __u32 mark, __u8 tos, __u8 scope,
100                                       __u8 proto, __u8 flags,
101                                       __be32 daddr, __be32 saddr,
102                                       __be16 dport, __be16 sport,
103                                       kuid_t uid)
104 {
105         fl4->flowi4_oif = oif;
106         fl4->flowi4_iif = LOOPBACK_IFINDEX;
107         fl4->flowi4_mark = mark;
108         fl4->flowi4_tos = tos;
109         fl4->flowi4_scope = scope;
110         fl4->flowi4_proto = proto;
111         fl4->flowi4_flags = flags;
112         fl4->flowi4_secid = 0;
113         fl4->flowi4_tun_key.tun_id = 0;
114         fl4->flowi4_uid = uid;
115         fl4->daddr = daddr;
116         fl4->saddr = saddr;
117         fl4->fl4_dport = dport;
118         fl4->fl4_sport = sport;
119 }
120 
121 /* Reset some input parameters after previous lookup */
122 static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos,
123                                         __be32 daddr, __be32 saddr)
124 {
125         fl4->flowi4_oif = oif;
126         fl4->flowi4_tos = tos;
127         fl4->daddr = daddr;
128         fl4->saddr = saddr;
129 }
130 
131 
132 struct flowi6 {
133         struct flowi_common     __fl_common;
134 #define flowi6_oif              __fl_common.flowic_oif
135 #define flowi6_iif              __fl_common.flowic_iif
136 #define flowi6_mark             __fl_common.flowic_mark
137 #define flowi6_scope            __fl_common.flowic_scope
138 #define flowi6_proto            __fl_common.flowic_proto
139 #define flowi6_flags            __fl_common.flowic_flags
140 #define flowi6_secid            __fl_common.flowic_secid
141 #define flowi6_tun_key          __fl_common.flowic_tun_key
142 #define flowi6_uid              __fl_common.flowic_uid
143         struct in6_addr         daddr;
144         struct in6_addr         saddr;
145         /* Note: flowi6_tos is encoded in flowlabel, too. */
146         __be32                  flowlabel;
147         union flowi_uli         uli;
148 #define fl6_sport               uli.ports.sport
149 #define fl6_dport               uli.ports.dport
150 #define fl6_icmp_type           uli.icmpt.type
151 #define fl6_icmp_code           uli.icmpt.code
152 #define fl6_ipsec_spi           uli.spi
153 #define fl6_mh_type             uli.mht.type
154 #define fl6_gre_key             uli.gre_key
155         __u32                   mp_hash;
156 } __attribute__((__aligned__(BITS_PER_LONG/8)));
157 
158 struct flowidn {
159         struct flowi_common     __fl_common;
160 #define flowidn_oif             __fl_common.flowic_oif
161 #define flowidn_iif             __fl_common.flowic_iif
162 #define flowidn_mark            __fl_common.flowic_mark
163 #define flowidn_scope           __fl_common.flowic_scope
164 #define flowidn_proto           __fl_common.flowic_proto
165 #define flowidn_flags           __fl_common.flowic_flags
166         __le16                  daddr;
167         __le16                  saddr;
168         union flowi_uli         uli;
169 #define fld_sport               uli.ports.sport
170 #define fld_dport               uli.ports.dport
171 } __attribute__((__aligned__(BITS_PER_LONG/8)));
172 
173 struct flowi {
174         union {
175                 struct flowi_common     __fl_common;
176                 struct flowi4           ip4;
177                 struct flowi6           ip6;
178                 struct flowidn          dn;
179         } u;
180 #define flowi_oif       u.__fl_common.flowic_oif
181 #define flowi_iif       u.__fl_common.flowic_iif
182 #define flowi_mark      u.__fl_common.flowic_mark
183 #define flowi_tos       u.__fl_common.flowic_tos
184 #define flowi_scope     u.__fl_common.flowic_scope
185 #define flowi_proto     u.__fl_common.flowic_proto
186 #define flowi_flags     u.__fl_common.flowic_flags
187 #define flowi_secid     u.__fl_common.flowic_secid
188 #define flowi_tun_key   u.__fl_common.flowic_tun_key
189 #define flowi_uid       u.__fl_common.flowic_uid
190 } __attribute__((__aligned__(BITS_PER_LONG/8)));
191 
192 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
193 {
194         return container_of(fl4, struct flowi, u.ip4);
195 }
196 
197 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
198 {
199         return container_of(fl6, struct flowi, u.ip6);
200 }
201 
202 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
203 {
204         return container_of(fldn, struct flowi, u.dn);
205 }
206 
207 typedef unsigned long flow_compare_t;
208 
209 static inline unsigned int flow_key_size(u16 family)
210 {
211         switch (family) {
212         case AF_INET:
213                 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
214                 return sizeof(struct flowi4) / sizeof(flow_compare_t);
215         case AF_INET6:
216                 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
217                 return sizeof(struct flowi6) / sizeof(flow_compare_t);
218         case AF_DECnet:
219                 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
220                 return sizeof(struct flowidn) / sizeof(flow_compare_t);
221         }
222         return 0;
223 }
224 
225 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys);
226 
227 #endif
228 

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