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 <asm/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  sport;
  30                 __be16  dport;
  31         } ports;
  32
  33         struct {
  34                 __u8    type;
  35                 __u8    code;
  36         } icmpt;
  37
  38         struct {
  39                 __le16  sport;
  40                 __le16  dport;
  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 struct flowi6 {
  74         struct flowi_common     __fl_common;
  75 #define flowi6_oif              __fl_common.flowic_oif
  76 #define flowi6_iif              __fl_common.flowic_iif
  77 #define flowi6_mark             __fl_common.flowic_mark
  78 #define flowi6_tos              __fl_common.flowic_tos
  79 #define flowi6_scope            __fl_common.flowic_scope
  80 #define flowi6_proto            __fl_common.flowic_proto
  81 #define flowi6_flags            __fl_common.flowic_flags
  82 #define flowi6_secid            __fl_common.flowic_secid
  83         struct in6_addr         daddr;
  84         struct in6_addr         saddr;
  85         __be32                  flowlabel;
  86         union flowi_uli         uli;
  87 #define fl6_sport               uli.ports.sport
  88 #define fl6_dport               uli.ports.dport
  89 #define fl6_icmp_type           uli.icmpt.type
  90 #define fl6_icmp_code           uli.icmpt.code
  91 #define fl6_ipsec_spi           uli.spi
  92 #define fl6_mh_type             uli.mht.type
  93 #define fl6_gre_key             uli.gre_key
  94 };
  95
  96 struct flowidn {
  97         struct flowi_common     __fl_common;
  98 #define flowidn_oif             __fl_common.flowic_oif
  99 #define flowidn_iif             __fl_common.flowic_iif
 100 #define flowidn_mark            __fl_common.flowic_mark
 101 #define flowidn_scope           __fl_common.flowic_scope
 102 #define flowidn_proto           __fl_common.flowic_proto
 103 #define flowidn_flags           __fl_common.flowic_flags
 104         __le16                  daddr;
 105         __le16                  saddr;
 106         union flowi_uli         uli;
 107 #define fld_sport               uli.ports.sport
 108 #define fld_dport               uli.ports.dport
 109 };
 110
 111 struct flowi {
 112         union {
 113                 struct flowi_common     __fl_common;
 114                 struct flowi4           ip4;
 115                 struct flowi6           ip6;
 116                 struct flowidn          dn;
 117         } u;
 118 #define flowi_oif       u.__fl_common.flowic_oif
 119 #define flowi_iif       u.__fl_common.flowic_iif
 120 #define flowi_mark      u.__fl_common.flowic_mark
 121 #define flowi_tos       u.__fl_common.flowic_tos
 122 #define flowi_scope     u.__fl_common.flowic_scope
 123 #define flowi_proto     u.__fl_common.flowic_proto
 124 #define flowi_flags     u.__fl_common.flowic_flags
 125 #define flowi_secid     u.__fl_common.flowic_secid
 126 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 127
 128 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 129 {
 130         return container_of(fl4, struct flowi, u.ip4);
 131 }
 132
 133 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 134 {
 135         return container_of(fl6, struct flowi, u.ip6);
 136 }
 137
 138 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 139 {
 140         return container_of(fldn, struct flowi, u.dn);
 141 }
 142
 143 #define FLOW_DIR_IN     0
 144 #define FLOW_DIR_OUT    1
 145 #define FLOW_DIR_FWD    2
 146
 147 struct net;
 148 struct sock;
 149 struct flow_cache_ops;
 150
 151 struct flow_cache_object {
 152         const struct flow_cache_ops *ops;
 153 };
 154
 155 struct flow_cache_ops {
 156         struct flow_cache_object *(*get)(struct flow_cache_object *);
 157         int (*check)(struct flow_cache_object *);
 158         void (*delete)(struct flow_cache_object *);
 159 };
 160
 161 typedef struct flow_cache_object *(*flow_resolve_t)(
 162                 struct net *net, const struct flowi *key, u16 family,
 163                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 164
 165 extern struct flow_cache_object *flow_cache_lookup(
 166                 struct net *net, const struct flowi *key, u16 family,
 167                 u8 dir, flow_resolve_t resolver, void *ctx);
 168
 169 extern void flow_cache_flush(void);
 170 extern atomic_t flow_cache_genid;
 171
 172 #endif