Pileus Git - ~andy/linux/blob - 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         __le16                  daddr;
  99         __le16                  saddr;
 100         union flowi_uli         uli;
 101 };
 102
 103 struct flowi {
 104         union {
 105                 struct flowi_common     __fl_common;
 106                 struct flowi4           ip4;
 107                 struct flowi6           ip6;
 108                 struct flowidn          dn;
 109         } u;
 110 #define flowi_oif       u.__fl_common.flowic_oif
 111 #define flowi_iif       u.__fl_common.flowic_iif
 112 #define flowi_mark      u.__fl_common.flowic_mark
 113 #define flowi_tos       u.__fl_common.flowic_tos
 114 #define flowi_scope     u.__fl_common.flowic_scope
 115 #define flowi_proto     u.__fl_common.flowic_proto
 116 #define flowi_flags     u.__fl_common.flowic_flags
 117 #define flowi_secid     u.__fl_common.flowic_secid
 118 #define fld_scope       flowi_scope
 119
 120 #define fld_dst         u.dn.daddr
 121 #define fld_src         u.dn.saddr
 122 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 123
 124 static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
 125 {
 126         return container_of(fl4, struct flowi, u.ip4);
 127 }
 128
 129 static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6)
 130 {
 131         return container_of(fl6, struct flowi, u.ip6);
 132 }
 133
 134 static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn)
 135 {
 136         return container_of(fldn, struct flowi, u.dn);
 137 }
 138
 139 #define FLOW_DIR_IN     0
 140 #define FLOW_DIR_OUT    1
 141 #define FLOW_DIR_FWD    2
 142
 143 struct net;
 144 struct sock;
 145 struct flow_cache_ops;
 146
 147 struct flow_cache_object {
 148         const struct flow_cache_ops *ops;
 149 };
 150
 151 struct flow_cache_ops {
 152         struct flow_cache_object *(*get)(struct flow_cache_object *);
 153         int (*check)(struct flow_cache_object *);
 154         void (*delete)(struct flow_cache_object *);
 155 };
 156
 157 typedef struct flow_cache_object *(*flow_resolve_t)(
 158                 struct net *net, const struct flowi *key, u16 family,
 159                 u8 dir, struct flow_cache_object *oldobj, void *ctx);
 160
 161 extern struct flow_cache_object *flow_cache_lookup(
 162                 struct net *net, const struct flowi *key, u16 family,
 163                 u8 dir, flow_resolve_t resolver, void *ctx);
 164
 165 extern void flow_cache_flush(void);
 166 extern atomic_t flow_cache_genid;
 167
 168 #endif