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 <linux/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